MCLEODUSA INC
424B3, 2000-11-02
RADIOTELEPHONE COMMUNICATIONS
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<PAGE>


                                                Filed pursuant to Rule 424(b)(3)
                                                   Registration number 333-48342
                       [CAPROCK COMMUNICATIONS CORP.LOGO]

                          CAPROCK COMMUNICATIONS CORP.
                        15601 Dallas Parkway, Suite 700
                              Dallas, Texas 75001

                  MERGER PROPOSED--YOUR VOTE IS VERY IMPORTANT

                                                                October 30, 2000

Dear fellow stockholder,

   You are cordially invited to attend our special meeting of stockholders on
December 5, 2000 at 9:00 a.m. local time, at our offices located at 15601
Dallas Parkway, Suite 700, Dallas, Texas 75001.

   At the special meeting, we will ask you to approve the acquisition of our
company by McLeodUSA Incorporated. In the merger, you will receive 0.3876 of a
share of McLeodUSA Class A common stock for each share of CapRock common stock
you own. As you know, CapRock common stock is quoted on the Nasdaq National
Market under the symbol "CPRK." The closing price for CapRock common stock on
October 27, 2000 was $6.375 per share. McLeodUSA Class A common stock is quoted
on the Nasdaq National Market under the symbol "MCLD." The closing price for
McLeodUSA Class A common stock on October 27, 2000 was $17.625 per share. You
will receive cash for any fractional share of McLeodUSA Class A common stock
that you would otherwise receive in the merger.

   Completion of the merger requires the approval of the merger agreement by
the holders of a majority of the outstanding shares of CapRock common stock.
Only stockholders who hold shares of CapRock common stock at the close of
business on October 19, 2000 will be entitled to vote at the special meeting.
CapRock stockholders holding approximately 52% of the aggregate voting power of
the CapRock common stock have agreed to vote all of their shares in favor of
the approval of the merger agreement. Consequently, the approval of the merger
agreement is assured.

   After careful consideration, the CapRock board of directors has unanimously
recommended the approval of the merger agreement and determined that its terms
are fair to and in the best interests of CapRock and its stockholders. The
CapRock board of directors recommends that you vote "FOR" the approval of the
merger agreement.

   This document provides you with detailed information about the meeting and
the proposed merger. You can also get information from publicly available
documents filed with the Securities and Exchange Commission. We encourage you
to read this entire document carefully, including the section entitled "Risk
Factors" beginning on page 14.
                                         Sincerely,

                                         /s/ Jere W. Thompson, Jr.
                                         Jere W. Thompson, Jr.
                                         Chairman of the Board
                                         and Chief Executive Officer
        PLEASE COMPLETE, SIGN, DATE AND RETURN THE ENCLOSED PROXY CARD.


    Neither the Securities and Exchange Commission nor any state securities
 commission has approved or disapproved of these securities or passed upon
 the adequacy or accuracy of this prospectus and proxy statement. Any
 representation to the contrary is a criminal offense.


   This proxy statement/prospectus is dated October 30, 2000 and is first being
              mailed to stockholders on or about November 2, 2000.
<PAGE>

                     REFERENCES TO ADDITIONAL INFORMATION

   This proxy statement/prospectus incorporates documents by reference which
are not presented in or delivered with this proxy statement/prospectus. This
information is available to you without charge upon your oral or written
request. With respect to McLeodUSA's documents, your requests should be
directed to McLeodUSA Incorporated, McLeodUSA Technology Park, 6400 C Street
SW, Post Office Box 3177, Cedar Rapids, Iowa 52406-3177, Attention: General
Counsel (telephone (319) 790-7775). With respect to CapRock's documents, your
requests should be directed to CapRock Communications Corp., 15601 Dallas
Parkway, Suite 700, Dallas, Texas 75001, Attention: Chief Financial Officer
(telephone (972) 982-9550). In order to ensure delivery of the documents in
advance of the special meeting, any request should be made at least five
business days prior to the date of the special meeting.

<PAGE>


                      [CAPROCK COMMUNICATIONS CORP. LOGO]
                          CAPROCK COMMUNICATIONS CORP.
                              15601 Dallas Parkway
                                   Suite 700
                              Dallas, Texas 75001

                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
                  TO BE HELD AT 9:00 A.M. ON DECEMBER 5, 2000

   We will hold a special meeting of stockholders of CapRock Communications
Corp., a Texas corporation, at 9:00 a.m., local time on December 5, 2000 at our
offices located at 15601 Dallas Parkway, Suite 700, Dallas, Texas 75001, for
the following purposes:

     1. to consider and vote upon a proposal to approve the Agreement and
  Plan of Merger, by and among McLeodUSA Incorporated, Cactus Acquisition
  Corp., a wholly-owned subsidiary of McLeodUSA Incorporated, and CapRock
  Communications Corp., dated as of October 2, 2000, as more fully described
  in this proxy statement/prospectus and

     2. to transact other business as may properly come before the special
  meeting.

   Only holders of record of CapRock common stock at the close of business on
October 19, 2000, which has been fixed as the record date for notice of the
special meeting, are entitled to notice of, and will be entitled to vote at,
the special meeting and any adjournments or postponements of the meeting.

   Completion of the merger requires the approval of the merger agreement by
the holders of a majority of the outstanding shares of CapRock common stock.
Stockholders of CapRock holding approximately 52% of the aggregate voting power
of the CapRock common stock have agreed to vote all of their shares in favor of
the approval of the merger agreement. Consequently, the approval of the merger
agreement is assured. Holders of CapRock common stock have no dissenters'
rights of appraisal under Texas law in connection with the merger.

   For more information about the merger, please read this proxy
statement/prospectus and the various documents attached as appendices,
including the merger agreement and the fairness opinion of Salomon Smith Barney
Inc.

   A complete list of stockholders entitled to vote at the meeting will be
available at the offices of CapRock during ordinary business hours for the 10-
day period before the special meeting for examination by any stockholder. This
list will also be available at the meeting.

   Whether or not you expect to be present at the meeting, please submit your
proxy by completing, dating, signing and returning the enclosed proxy card,
which is solicited by the CapRock board of directors. The shares represented by
the proxy will be voted according to your specified response. The proxy is
revocable and will not affect your right to vote in person if you attend the
meeting. Properly executed proxies that do not contain voting instructions will
be voted for the approval of the merger agreement.

                                         By Order of the Board of Directors


                                         /s/ Jere W. Thompson, Jr.
                                         Jere W. Thompson, Jr.
                                         Chairman of the Board
                                         and Chief Executive Officer
Dallas, Texas
October 30, 2000
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                           Page
                                                                           ----
<S>                                                                        <C>
SUMMARY...................................................................   1
  The Companies...........................................................   1
  The Special Meeting.....................................................   2
  The Merger..............................................................   2
  Recommendation of the CapRock Board of Directors........................   4
  Opinion of the CapRock Financial Advisor................................   4
  Differences in the Rights of Stockholders...............................   4
  Selected Consolidated Financial Data of McLeodUSA.......................   5
  Selected Consolidated Financial Data of CapRock.........................   9
  Comparative Per Share Data..............................................  12
  Comparative Market Data.................................................  13
RISK FACTORS..............................................................  14
CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS......................  23
THE SPECIAL MEETING.......................................................  24
THE MERGER................................................................  26
  Background of the Merger................................................  26
  Recommendation of the CapRock Board of Directors and Reasons for the
   Merger.................................................................  29
  McLeodUSA's Reasons for the Merger......................................  32
  Opinion of the CapRock Financial Advisor................................  32
  Independent Auditors....................................................  37
  Interests of the CapRock Directors and Executive Officers in the
   Merger.................................................................  37
  Accounting Treatment....................................................  39
  Listing of McLeodUSA Class A Common Stock...............................  39
  Delisting and Deregistration of CapRock Common Stock....................  39
  Governmental and Regulatory Approvals...................................  39
  Federal Income Tax Consequences.........................................  40
  Restrictions on Resales by Affiliates...................................  42
  No Appraisal Rights.....................................................  42
  CapRock Debt Securities.................................................  43
TERMS OF THE MERGER AGREEMENT AND RELATED TRANSACTIONS....................  44
  Structure of the Merger.................................................  44
  Conversion of CapRock Common Stock; Treatment of Options................  44
  Exchange of Certificates................................................  45
  Continuation of Employee Benefits.......................................  46
  Effective Time..........................................................  47
  Representations and Warranties..........................................  47
  Business of CapRock and Its Subsidiaries Pending the Merger.............  48
  No Solicitation by CapRock..............................................  49
  Directors' and Officers' Insurance and Indemnification..................  51
  Conditions to Completion of the Merger..................................  52
  Termination of the Merger Agreement.....................................  53
  Expenses; Termination Fee...............................................  54
  Waiver and Amendment of the Merger Agreement............................  54
  Voting Agreements.......................................................  54
  Grant of Option.........................................................  55
  Credit Agreement........................................................  57
  Other Agreements........................................................  58
INFORMATION ABOUT McLEODUSA AND CACTUS ACQUISITION CORP...................  59
SELECTED CONSOLIDATED FINANCIAL DATA OF McLEODUSA.........................  62
</TABLE>

                                      (i)
<PAGE>

<TABLE>
<CAPTION>
                                                                          Page
                                                                          ----
<S>                                                                       <C>
PRO FORMA FINANCIAL DATA.................................................  66
INFORMATION ABOUT CAPROCK................................................  72
SELECTED CONSOLIDATED FINANCIAL DATA OF CAPROCK..........................  74
McLEODUSA CAPITAL STOCK AND COMPARISON OF STOCKHOLDER RIGHTS.............  77
LEGAL MATTERS............................................................  98
EXPERTS..................................................................  98
OTHER MATTERS............................................................  98
SUBMISSION OF FUTURE STOCKHOLDER PROPOSALS...............................  99
WHERE YOU CAN FIND MORE INFORMATION......................................  99

                                   APPENDICES

Appendix A--Agreement and Plan of Merger among McLeodUSA, Cactus
 Acquisition Corp. and CapRock........................................... A-1
Appendix B--Voting and Option Agreement between McLeodUSA and various
 stockholders of CapRock................................................. B-1
Appendix C--Voting Agreement between McLeodUSA and a stockholder of
 CapRock................................................................. C-1
Appendix D--Opinion of Salomon Smith Barney Inc., dated as of October 2,
 2000.................................................................... D-1
</TABLE>

                                      (ii)
<PAGE>

                      QUESTIONS & ANSWERS ABOUT THE MERGER

Q. What will I receive for my CapRock shares?

A. You will receive 0.3876 of a share of McLeodUSA Class A common stock for
   each share of CapRock common stock that you own at the effective time of the
   merger. You will receive cash for any fractional share that you would
   otherwise receive in the merger. Based on the closing price per share of
   McLeodUSA Class A common stock on the Nasdaq National Market on October 27,
   2000, the value of 0.3876 of a share of McLeodUSA Class A common stock was
   $6.831. The market value of the shares of McLeodUSA Class A common stock
   that you will receive in the merger will fluctuate both before and after the
   merger. After the merger, CapRock stockholders will own approximately 2% of
   the outstanding shares of McLeodUSA Class A common stock on a fully diluted
   basis.

  For example: A CapRock stockholder who owns 1,000 shares of CapRock common
  stock will be entitled to receive after the merger 387 shares of McLeodUSA
  Class A common stock, plus a check for the market value of six-tenths of a
  share.

Q. What are the federal income tax consequences of the merger?

A. In general, it is expected that CapRock stockholders will not be required to
   pay federal income tax as a result of exchanging CapRock shares for
   McLeodUSA shares, except for taxes on any cash that is received in lieu of
   fractional shares.

Q. When and where will the special meeting take place?

A. The special meeting will be held on December 5, 2000 at 9:00 a.m., local
   time, at the offices of CapRock located at 15601 Dallas Parkway, Suite 700,
   Dallas, Texas 75001.

Q. What should I do now?

A. You should carefully read and consider the information contained in this
   proxy statement/prospectus. You should then complete, date and sign your
   proxy card and return it in the enclosed return envelope as soon as possible
   so that your shares will be represented at the special meeting. You may also
   vote in person at the special meeting. If you do not return your proxy card
   or otherwise vote at the special meeting, it will have the same effect as if
   you voted against the approval of the merger agreement.

Q. Can I change my mind and revoke my proxy?

A. Yes. You may take back your proxy up to and including the day of the special
   meeting by following the directions on page 24. Then you can either grant a
   new proxy or attend the special meeting and vote in person.

Q. If my shares are held in "street name" by my broker, will my broker vote my
   shares for me?

A. Your broker will vote your shares only if you instruct your broker on how to
   vote. Your broker will send you directions on how you can instruct him or
   her to vote. Your broker cannot vote your shares without instructions from
   you.

Q. Should I send in my CapRock stock certificate now?

A. No, you should not send in your stock certificate with your proxy. Promptly
   after the merger is completed, McLeodUSA will send written instructions to
   former CapRock stockholders describing the process for exchanging their
   CapRock stock certificates for McLeodUSA stock certificates.

Q. Are CapRock stockholders entitled to dissenters' rights?

A. No. Under Texas law, CapRock stockholders are not entitled to dissenters'
   rights of appraisal.

                                     (iii)
<PAGE>

Q. When do the companies expect the merger to be completed?

A. We are working to complete the merger as quickly as possible. We plan to
   complete the merger promptly after the special meeting.

Q. Whom should I call if I have questions?

A. Stockholders who have questions about the merger may call the Chief
   Financial Officer of CapRock, at (972) 982-9550.

                                    *  *  *

                                      (iv)
<PAGE>


                                    SUMMARY

   This document is a prospectus of McLeodUSA and a proxy statement of CapRock.
This summary highlights selected information from this proxy
statement/prospectus. It does not contain all of the information that may be
important to you. You should carefully read this entire proxy
statement/prospectus and the other documents to which this document refers you.
See "Where You Can Find More Information." In addition, you should carefully
consider the factors set forth under the caption "Risk Factors."

                                 The Companies

McLeodUSA Incorporated
McLeodUSA Technology Park
6400 C Street SW, P.O. Box 3177
Cedar Rapids, Iowa 52406-3177
(319) 790-7800

McLeodUSA provides selected telecommunications services to customers
nationwide. McLeodUSA provides integrated communications services, including
local services, in many Midwest and Rocky Mountain states and long distance and
advanced data services in all 50 states. McLeodUSA is a facilities-based
telecommunications provider with 361 ATM switches, 37 voice switches, nearly
824,000 local lines and more than 9,000 employees. McLeodUSA expanded its
marketplace for advanced data and Internet services to all 50 states through
its March 30, 2000 acquisition of Splitrock Services, Inc. The network acquired
in the Splitrock transaction is capable of transmitting integrated next-
generation data, video and voice services, reaching 800 cities and 90% of the
U.S. population. In the next 12 months, McLeodUSA plans to distribute 30
million telephone directories in 26 states, serving a population of 51 million.
McLeodUSA is a Nasdaq-100 company traded under the symbol "MCLD."

McLeodUSA offers local, long distance, Internet access, data, voice mail and
paging services from a single company on a single bill. McLeodUSA believes it
is the first company in many of its markets to offer one-stop shopping for
communications services tailored to customers' specific needs.

McLeodUSA's core business is providing communications services in competition
with existing local telephone companies, including:

  .  local and long distance services

  .  dial and dedicated Internet access

  .  higher bandwidth Internet access services, such as digital subscriber
     line (DSL) and cable modem

  .  value-added services such as virtual private networks and web hosting

  .  bandwidth leasing and colocation services

  .  facilities and services dedicated for a particular customer's use

  .  telephone and computer sales, leasing, networking, service and
     installation

  .  other communications services, including video, cellular, operator,
     payphone, mobile radio, wireless communications and paging services

McLeodUSA also derives revenue from the following services related to its core
business:

  .  sale of advertising in print and electronic telephone directories

  .  traditional local telephone company services in east central Illinois
     and southeast South Dakota

  .  telemarketing services

In most of its markets, McLeodUSA competes with the existing local phone
company by leasing its lines and switches. McLeodUSA provides long distance
services by using its own facilities and by leasing capacity from others.
McLeodUSA is actively developing fiber optic communications networks in many of
its target local markets to carry additional communications traffic on its own
network. McLeodUSA is actively developing enhancements to its national network
and associated next-generation services to provide increased control and
service quality and a base for growth.

                                       1
<PAGE>


CapRock Communications Corp.
15601 Dallas Parkway, Suite 700
Dallas, Texas 75001
(972) 982-9550

CapRock is a facilities-based integrated communications service provider
primarily to small and medium-sized business and communications carrier
customers in the Southwestern United States. CapRock offers business customers
an integrated bundle of communications products and services including local
exchange, domestic and international long distance, enhanced voice, data,
Internet, DSL and dedicated private line services. Additionally, CapRock offers
its communications-intensive business and carrier customers dark fiber, high
bandwidth dedicated fiber infrastructure, terminating access for domestic and
international long distance and ATM, frame relay and IP data transport
services.

CapRock's communications services are provided through resale and over its
fiber, voice and data networks. As of June 30, 2000, the CapRock network
covered approximately 4,500 route miles (including 22 metro fiber loops in key
markets). Additionally, as of June 30, 2000, CapRock provided switch-based
competitive local exchange services in 13 markets. As of June 30, 2000, CapRock
had 12 voice and 17 data switches installed and operational on its network.

                              The Special Meeting
                                   (page 24)

The special meeting of CapRock stockholders will be held on December 5, 2000 at
9:00 a.m., local time, at the offices of CapRock located at 15601 Dallas
Parkway, Suite 700, Dallas, Texas 75001. At the special meeting, you will be
asked to vote to approve the merger agreement.

You can vote, or submit a proxy to vote, at the special meeting if you were a
record holder of CapRock common stock at the close of business on October 19,
2000. You can vote your shares by attending the meeting and voting in person or
by marking the enclosed proxy card with your vote, signing it and mailing it in
the enclosed return envelope. You can revoke your proxy at any time before it
is exercised.

Vote Required (page 24)

The approval of at least a majority of all of the outstanding shares of CapRock
common stock is required to approve the merger agreement. There were 38,729,536
shares of CapRock common stock outstanding as of October 19, 2000. Each holder
of CapRock common stock is entitled to one vote per share with respect to all
matters on which a vote is to be taken at the special meeting.

The directors and executive officers of CapRock and their affiliates hold
12,772,739 shares of CapRock common stock, or approximately 33% of the
outstanding shares entitled to vote at the special meeting. Moreover, in
connection with the merger agreement, McLeodUSA and several CapRock
stockholders beneficially owning in the aggregate 19,979,230 shares of CapRock
common stock, representing approximately 52% of the outstanding shares of
CapRock common stock as of the record date, entered into agreements under which
these CapRock stockholders have agreed to vote in favor of the approval of the
merger agreement. These agreements are attached as Appendices B and C to this
proxy statement/prospectus. These stockholders together own enough shares to
cause the merger agreement to be approved at the special meeting.

                              The Merger (page 26)

Under the merger agreement, Cactus Acquisition Corp. will be merged with and
into CapRock, with CapRock surviving as a wholly-owned subsidiary of McLeodUSA.
McLeodUSA and CapRock plan to complete the merger promptly after the special
meeting.

The merger agreement is included as Appendix A to this proxy
statement/prospectus. It is the legal document that governs the merger.

What You Will Receive in the Merger (page 44)

If the merger is completed as proposed, each outstanding share of CapRock
common stock that you own will be converted into the right to receive 0.3876 of
a share of McLeodUSA Class A common stock. You will also receive a cash payment
for any fraction of a share of McLeodUSA Class A common

                                       2
<PAGE>

stock that you would otherwise be entitled to receive.

Exchange of CapRock Stock Certificates (page 45)

After the merger occurs, Wells Fargo Bank Minnesota, N.A., the exchange agent
designated by McLeodUSA, will send a letter of transmittal to you that will
provide instructions on the procedure for exchanging your CapRock stock
certificates for McLeodUSA stock certificates.

Please do not send any stock certificates at this time.

No Appraisal Rights (page 42)

Under Texas law, CapRock stockholders are not entitled to dissenters' rights of
appraisal in connection with the merger.

What is Needed to Complete the Merger (page 52)

McLeodUSA and CapRock will complete the merger only if they satisfy or, if the
law permits, waive, several conditions, including the following:

  .  holders of a majority of the outstanding shares of CapRock common stock
     must approve the merger agreement (holders of such a majority have
     agreed to approve the merger agreement)

  .  the waiting period under the Hart-Scott-Rodino Antitrust Improvements
     Act of 1976 must have expired or been terminated

  .  CapRock must have obtained the written consent of a majority of the
     aggregate principal amount of each of the two series of its outstanding
     notes to amendments to the indentures which will eliminate most of the
     restrictive covenants contained in the indentures and which will provide
     that the merger will not violate the indentures or constitute a change
     of control under the indentures

  .  Munsch Hardt Kopf & Harr, P.C., counsel to CapRock, must deliver an
     opinion to CapRock stating that the merger will qualify for United
     States federal income tax purposes as a tax free reorganization within
     the meaning of the Internal Revenue Code

  .  other customary contractual conditions set forth in the merger agreement

Federal Income Tax Consequences (page 40)

The merger is expected to be tax free to CapRock stockholders for United States
federal income tax purposes, except with respect to cash received for
fractional shares of McLeodUSA Class A common stock.

Determining the actual tax consequences of the merger to a CapRock stockholder
can be complicated. Such consequences will depend on the stockholder's specific
situation and on variables not within the control of CapRock or McLeodUSA.
CapRock stockholders should consult with their own tax advisors for a full
understanding of the tax consequences to them of the merger.

Accounting Treatment (page 39)

McLeodUSA and CapRock will account for the merger using the purchase method of
accounting.

Interests of the CapRock Directors and Executive Officers in the Merger (page
37)

Some of the CapRock directors and executive officers have interests in the
merger that are different from, or in addition to, their interests as CapRock
stockholders. These interests exist because of indemnification agreements,
employment agreements and other agreements that the directors and executive
officers have with CapRock and rights that they have under benefit and
compensation plans. Various CapRock directors or executive officers may enter
into employment, advisory and other agreements or arrangements with McLeodUSA.
The merger agreement requires McLeodUSA to indemnify directors and executive
officers of CapRock for events occurring before the merger, including events
that are related to the merger.

Governmental and Regulatory Approvals (page 39)

United States antitrust laws prohibit McLeodUSA and CapRock from completing the
merger until after

                                       3
<PAGE>

they have furnished certain information and materials to the Antitrust Division
of the Department of Justice and the Federal Trade Commission and a required
waiting period has expired or been terminated. McLeodUSA and CapRock each
filed, on October 12, 2000 and October 13, 2000, respectively, the required
notification and report forms with the Antitrust Division of the Department of
Justice and the FTC, and were granted early termination of the waiting period
by the FTC on October 24, 2000. McLeodUSA and CapRock have filed applications
to complete the merger with the Federal Communications Commission and the state
public utility commissions (PUCs) in Louisiana, Oklahoma, Texas, Florida and
California. In other states, where CapRock has only minimal customers, CapRock
and McLeodUSA intend to transfer those customers from CapRock to McLeodUSA.
CapRock will soon file for approval to relinquish its intrastate interexchange
(IXC) certificates in those certain jurisdictions in which (a) McLeodUSA
already holds the authority required to provide the IXC services and (b)
regulatory approval of the merger would be required if CapRock's certificates
were not relinquished.

While neither CapRock nor McLeodUSA knows of any reason why the requested
approvals will not be obtained in a timely manner, CapRock and McLeodUSA cannot
be certain when or if they will receive them.

Termination of the Merger Agreement; Termination Fee (page 53)

The merger agreement contains provisions addressing the circumstances under
which McLeodUSA or CapRock may terminate the merger agreement. In addition, the
merger agreement provides that in several circumstances, CapRock may be
required to pay McLeodUSA a termination fee of $7.85 million.

Grant of Option (page 55)

CapRock stockholders owning 15,023,729 shares of CapRock common stock,
representing approximately 39% of the outstanding shares of CapRock common
stock as of the record date, have granted McLeodUSA an option to purchase their
shares of CapRock common stock. The option is exercisable under several
circumstances, including those under which CapRock is required to pay to
McLeodUSA the termination fee of $7.85 million.


Exchange Offers (page 43)

McLeodUSA has prepared and filed a registration statement on Form S-4 to effect
exchange offers to acquire all of the outstanding CapRock 12% senior notes due
2008 and CapRock 11 1/2% senior notes due 2009 in exchange for notes of
McLeodUSA having the same interest rate, payment, maturity and redemption terms
as the applicable CapRock notes. These exchange offers are expected to be
completed concurrently with the completion of the merger.

                Recommendation of the CapRock Board of Directors
                                   (page 29)

The CapRock board of directors recommends that you vote "FOR" the approval of
the merger agreement.

                    Opinion of the CapRock Financial Advisor
                                   (page 32)

Salomon Smith Barney, financial advisor to CapRock, delivered an opinion to the
CapRock board of directors that, as of October 2, 2000, the exchange ratio of
0.3876 of a share of McLeodUSA Class A common stock was fair to the holders of
CapRock common stock from a financial point of view. We have attached this
opinion as Appendix D to this proxy statement/prospectus.

                   Differences in the Rights of Stockholders
                                   (page 89)

When the merger is completed, CapRock stockholders will become stockholders of
McLeodUSA. CapRock stockholders' rights will be governed by Delaware law and by
the McLeodUSA certificate of incorporation and bylaws, rather than by Texas law
and the CapRock articles of incorporation and bylaws.

                                       4
<PAGE>

               Selected Consolidated Financial Data of McLeodUSA

   The information in the following unaudited table is based on historical
financial information included in the prior SEC filings of McLeodUSA, including
the McLeodUSA Annual Report on Form 10-K for the fiscal year ended December 31,
1999 and the Quarterly Report on Form 10-Q for the quarter ended June 30, 2000.
The following summary financial information should be read in connection with
this historical financial information including the notes which accompany such
financial information. This historical financial information is considered a
part of this document. See "Where You Can Find More Information." The audited
historical financial statements of McLeodUSA as of December 31, 1999, 1998 and
1997, and for each of the three years in the period ended December 31, 1999
were audited by Arthur Andersen LLP, independent public accountants.

   The information in the following table reflects financial information for
the following companies McLeodUSA has acquired:

<TABLE>
<CAPTION>
       Acquired Company                                         Date Acquired
       ----------------                                       ------------------
   <S>                                                        <C>
   MWR Telecom, Inc. ........................................   April 28, 1995
   Ruffalo, Cody & Associates, Inc. .........................   July 15, 1996
   Telecom*USA Publishing Group, Inc. ....................... September 20, 1996
   Consolidated Communications, Inc. ........................ September 24, 1997
   Ovation Communications, Inc. .............................   March 31, 1999
   Splitrock Services, Inc. .................................   March 30, 2000
</TABLE>

   The operations statement data and other financial data in the table include
the operations of these companies beginning on the dates they were acquired.
The balance sheet data in the table include the financial position of these
companies at the end of the periods presented. These acquisitions affect the
comparability of the financial data for the periods presented.

   The pro forma information presented in the operations statement data and
other financial data in the table includes the operations of Ovation, Splitrock
and CapRock as if they had been acquired at the beginning of the periods
presented and the as adjusted information in the balance sheet data in the
table includes the Ovation, Splitrock and CapRock financial position as of the
date presented. The 1999 pro forma amounts include adjustments to the CapRock
1999 historical financial statements to give effect to the issuance by CapRock
in May 1999 of $210 million of its 11 1/2% senior notes as if the note issuance
had occurred at the beginning of such period.

   The information in the table also reflects the following debt and equity
securities that McLeodUSA has outstanding:

<TABLE>
<CAPTION>
     Description of Securities              Principal Amount    Date Issued
     -------------------------              ---------------- ------------------
<S>                                         <C>              <C>
10 1/2% senior discount notes due March 1,
 2007.....................................    $500 million     March 4, 1997
9 1/4% senior notes due July 15, 2007.....    $225 million     July 21, 1997
8 3/8% senior notes due March 15, 2008....    $300 million     March 10, 1998
9 1/2% senior notes due November 1, 2008..    $300 million    October 30, 1998
8 1/8% senior notes due February 15,
 2009.....................................    $500 million   February 22, 1999
Series A preferred stock..................    $287 million    August 23, 1999
Series B preferred stock..................    $687 million   September 15, 1999
Series C preferred stock..................    $313 million   September 15, 1999
Senior Secured Credit Facilities..........    $575 million      May 30, 2000
</TABLE>

                                       5
<PAGE>


   The operations statement data and other financial data in the table include
the effects of the issuances beginning on the dates the securities were issued.
The balance sheet data in the table include the effects of these issuances at
the end of the periods presented. The pro forma information presented in the
operations statement data and other financial data in the table includes the
effects of the issuance of the 8 1/8% senior notes, the Series A, B and C
preferred stock and the Senior Secured Credit Facilities as if they had
occurred at the beginning of 1999.

   On June 30, 1999, McLeodUSA announced that its board of directors had
declared a two-for-one stock split to be effected in the form of a stock
dividend. The record date for the stock split was July 12, 1999. Stockholders
of record at the market close on that date received one additional share of
McLeodUSA Class A common stock for each share held. Distribution of the
additional shares took place on July 26, 1999. On February 29, 2000, McLeodUSA
announced that its board of directors had declared a three-for-one stock split
to be effected in the form of a stock dividend. The record date for the stock
split was April 4, 2000. Stockholders of record at the market close on that
date received two additional shares of McLeodUSA Class A common stock for each
share held. Distribution of the additional shares took place on April 24, 2000.
All information in the selected consolidated financial data has been adjusted
to reflect the two-for-one stock split and the three-for-one stock split.

                                                 (table begins on the next page)

                                       6
<PAGE>

               Selected Consolidated Financial Data of McLeodUSA
                     (In thousands, except per share data)

<TABLE>
<CAPTION>
                                          Year Ended December 31,
                         ---------------------------------------------------------------
                                                                              Pro Forma
                           1995      1996      1997      1998       1999        1999
                         --------  --------  --------  ---------  ---------  -----------
                                                                             (unaudited)
<S>                      <C>       <C>       <C>       <C>        <C>        <C>
Operations Statement
 Data:
 Revenue................ $ 28,998  $ 81,323  $267,886  $ 604,146  $ 908,792  $1,210,667
                         --------  --------  --------  ---------  ---------  ----------
 Operating expenses:
  Cost of service.......   19,667    52,624   151,190    323,208    457,085     699,401
  Selling, general and
   administrative.......   18,054    46,044   148,158    260,931    392,687     481,488
  Depreciation and
   amortization.........    1,835     8,485    33,275     89,107    190,695     346,131
  Other.................      --      2,380     4,632      5,575        --          --
                         --------  --------  --------  ---------  ---------  ----------
  Total operating
   expenses.............   39,556   109,533   337,255    678,821  1,040,467   1,527,020
 Operating loss.........  (10,558)  (28,210)  (69,369)   (74,675)  (131,675)   (316,353)
 Interest income
  (expense), net........     (771)    5,369   (11,967)   (52,234)   (94,244)   (191,068)
 Other income...........      --        495     1,426      1,997      5,637       7,163
 Income taxes...........      --        --        --         --         --          --
                         --------  --------  --------  ---------  ---------  ----------
 Net loss...............  (11,329)  (22,346)  (79,910)  (124,912)  (220,282)   (500,528)
 Preferred stock
  dividends.............      --        --        --         --     (17,727)    (54,375)
                         --------  --------  --------  ---------  ---------  ----------
 Loss applicable to
  common stock.......... $(11,329) $(22,346) $(79,910) $(124,912) $(238,009) $ (554,633)
                         ========  ========  ========  =========  =========  ==========
 Loss per common share.. $   (.07) $   (.09) $   (.24) $    (.33) $    (.54) $     (.99)
                         ========  ========  ========  =========  =========  ==========
 Weighted average common
  shares outstanding....  168,024   243,036   329,844    376,842    443,130     559,751
                         ========  ========  ========  =========  =========  ==========
</TABLE>

<TABLE>
<CAPTION>
                                                 Six Months Ended June 30,
                                            -----------------------------------
                                                                     Pro Forma
                                               1999        2000        2000
                                            ----------- ----------- -----------
                                            (unaudited) (unaudited) (unaudited)
<S>                                         <C>         <C>         <C>
Operations Statement Data:
 Revenue...................................  $ 403,771   $ 620,082   $ 769,055
                                             ---------   ---------   ---------
 Operating expenses:
  Cost of service..........................    205,507     344,426     466,226
  Selling, general and administrative......    178,339     256,563     309,973
  Depreciation and amortization............     78,708     163,193     213,415
  Other....................................        --          --          872
                                             ---------   ---------   ---------
  Total operating expenses.................    462,554     764,182     990,486
 Operating loss............................    (58,783)   (144,100)   (221,431)
 Interest income (expense), net............    (50,666)    (42,077)    (70,486)
 Other income..............................        562       1,971       1,996
 Income taxes..............................        --          --          --
                                             ---------   ---------   ---------
 Net loss..................................   (108,887)   (184,206)   (289,921)
 Preferred stock dividends.................        --      (27,204)    (27,204)
                                             ---------   ---------   ---------
 Loss applicable to common stock...........  $(108,887)  $(211,410)  $(317,125)
                                             =========   =========   =========
 Loss per common share.....................  $    (.26)  $    (.40)  $    (.54)
                                             =========   =========   =========
 Weighted average common shares
  outstanding..............................    423,210     529,109     590,221
                                             =========   =========   =========
</TABLE>

                                       7
<PAGE>

               Selected Consolidated Financial Data of McLeodUSA
                     (In thousands, except per share data)

<TABLE>
<CAPTION>
                                           December 31,                          June 30, 2000
                         -------------------------------------------------- -----------------------
                          1995      1996      1997       1998       1999      Actual     Pro Forma
                         -------  -------- ---------- ---------- ---------- ----------- -----------
                                                                            (unaudited) (unaudited)
<S>                      <C>      <C>      <C>        <C>        <C>        <C>         <C>
Balance Sheet Data:
 Current assets......... $ 8,507  $224,401 $  517,869 $  793,192 $1,569,473 $1,647,070  $1,879,002
 Working capital
  (deficit)............. $(1,208) $185,968 $  378,617 $  613,236 $1,272,794 $  859,997  $  913,955
 Property and equipment,
  net................... $16,119  $ 92,123 $  373,804 $  629,746 $1,270,032 $1,897,962  $2,321,001
 Total assets........... $28,986  $452,994 $1,345,652 $1,925,197 $4,203,147 $7,069,543  $7,791,496
 Long-term debt......... $ 3,600  $  2,573 $  613,384 $1,245,170 $1,763,725 $2,370,370  $2,718,588
 Redeemable convertible
  preferred stock....... $   --   $    --  $      --  $      --  $1,000,000 $1,000,000  $1,000,000
 Stockholders' equity... $14,958  $403,429 $  559,379 $  462,806 $1,108,542 $2,878,436  $3,074,207
</TABLE>

<TABLE>
<CAPTION>
                                          Year Ended December 31,
                          ----------------------------------------------------------
                                                                          Pro Forma
                           1995      1996      1997      1998     1999      1999
                          -------  --------  --------  -------- -------- -----------
                                                                         (unaudited)
<S>                       <C>      <C>       <C>       <C>      <C>      <C>
Other Financial Data:
 Capital expenditures
 Property, plant and
  equipment.............  $ 6,364  $ 79,845  $179,255  $289,923 $580,003 $  820,756
 Business acquisitions..  $ 8,333  $ 93,937  $421,882  $ 49,737 $736,626 $3,376,180
 EBITDA(1)..............  $(8,723) $(17,345) $(31,462) $ 20,007 $ 59,020 $   29,778
</TABLE>

<TABLE>
<CAPTION>
                                                 Six Months Ended June 30,
                                            -----------------------------------
                                                                     Pro Forma
                                               1999        2000        2000
                                            ----------- ----------- -----------
                                            (unaudited) (unaudited) (unaudited)
<S>                                         <C>         <C>         <C>
Other Financial Data:
 Capital expenditures
 Property, plant and equipment............   $220,390   $  559,834  $  804,163
 Business acquisitions....................   $525,161   $2,052,925  $2,415,523
 EBITDA(1)................................   $ 19,925   $   19,093  $   (7,144)
</TABLE>
--------
(1) EBITDA consists of operating loss before depreciation, amortization and
    other nonrecurring operating expenses. McLeodUSA has included EBITDA data
    because it is a measure commonly used in the industry. EBITDA is not a
    measure of financial performance under generally accepted accounting
    principles and should not be considered an alternative to net income as a
    measure of performance or to cash flows as a measure of liquidity.

                                       8
<PAGE>

                Selected Consolidated Financial Data of CapRock
                     (In thousands, except per share data)

   The following table sets forth financial data as of and for the years ended
December 31, 1995, 1996, 1997, 1998 and 1999 and as of and for the six months
ended June 30, 1999 and 2000. The business combination among CapRock's
predecessor companies was completed on August 26, 1998 and was accounted for as
a pooling of interests. Accordingly, these Consolidated Financial Statements
include CapRock's three predecessor companies (CapRock Telecommunications
Corp., CapRock Fiber Network, LTD. and IWL Communications, Incorporated) as
though these entities were always a part of CapRock.

   In May 1998, IWL Communications changed its fiscal year end to coincide with
the fiscal years of CapRock, CapRock Telecommunications and CapRock Fiber. The
Consolidated Statement of Operations for the year ended December 31, 1996
combines the operating activity of IWL Communications for the year ended June
30, 1996 with the operating activity of CapRock Telecommunications and CapRock
Fiber for the year ended December 31, 1996. The net income of IWL
Communications in the amount of approximately $260,000 for the six month period
ended December 31, 1996 was excluded from the Consolidated Statement of
Operations for the year ended December 31, 1996 as a result of the non-
conforming year ends for such period. This amount was included as an adjustment
to retained earnings in the Consolidated Statement of Stockholders' Equity and
Comprehensive Income in 1997. IWL Communications' cash flow for this period was
added to the 1997 beginning balance in the Consolidated Statement of Cash
Flows.

<TABLE>
<CAPTION>
                                 As of and for the Year Ended December 31,
                                 ---------------------------------------------
                                  1995     1996     1997      1998      1999
                                 -------  -------  -------  --------  --------
<S>                              <C>      <C>      <C>      <C>       <C>
Statement of Operations Data:
 Revenues......................  $29,407  $50,970  $75,349  $121,774  $192,623
 Costs of Services.............   21,185   39,357   52,471    83,221   115,676
                                 -------  -------  -------  --------  --------
  Gross profit.................    8,222   11,613   22,878    38,553    76,947
 Operating expenses:
 Selling, general and
  administrative...............    7,326    8,983   14,074    23,528    56,535
 Merger related expenses.......      --       --       --      2,313       --
 Depreciation and
  amortization.................    1,186    1,536    3,346     4,887     9,698
                                 -------  -------  -------  --------  --------
  Total operating expenses.....    8,512   10,519   17,420    30,728    66,233
                                 -------  -------  -------  --------  --------
 Operating income (loss).......     (290)   1,094    5,458     7,825    10,714
 Interest expense, net.........     (484)    (585)  (1,603)   (6,441)  (17,861)
 Other income (expense)........      151       42      220       106     1,526
                                 -------  -------  -------  --------  --------
 Income (loss) before income
  taxes and extraordinary
  item.........................     (623)     551    4,075     1,490    (5,621)
 Income tax expense (benefit)..       48      227    1,513     1,267    (2,080)
                                 -------  -------  -------  --------  --------
 Income (loss) before
  extraordinary item...........     (671)     324    2,562       223    (3,541)
 Extraordinary item--
  extinguishment of debt.......      645      --       --        --        --
                                 -------  -------  -------  --------  --------
  Net income (loss)............  $   (26) $   324  $ 2,562  $    223  $ (3,541)
                                 =======  =======  =======  ========  ========
 Pro forma net income (loss):
 Income (loss) before income
  taxes and extraordinary
  item.........................  $  (623) $   551  $ 4,075  $  1,490  $ (5,621)
 Pro forma income taxes, as if
  CapRock Fiber were a C
  corporation..................     (211)     143    1,475     1,267    (2,080)
                                 -------  -------  -------  --------  --------
 Income (loss) before
  extraordinary item...........     (412)     408    2,600       223    (3,541)
 Extraordinary item, net of
  taxes........................      397      --       --        --        --
                                 -------  -------  -------  --------  --------
  Pro forma net income (loss)..  $   (15) $   408  $ 2,600  $    223  $ (3,541)
                                 =======  =======  =======  ========  ========
 Historical and pro forma
  income (loss) per common
  share:
 Income (loss) before
  extraordinary item...........  $ (0.02) $  0.01  $  0.09  $   0.01  $  (0.11)
 Extraordinary item, net of
  tax..........................  $  0.02      --       --        --        --
                                 -------  -------  -------  --------  --------
 Basic and diluted.............  $   --   $  0.01  $  0.09  $   0.01  $  (0.11)
                                 =======  =======  =======  ========  ========
 Weighted average shares
  outstanding:
 Basic.........................   25,926   27,146   27,984    28,899    31,727
 Diluted.......................   25,936   27,156   28,481    30,028    31,727
</TABLE>

                                       9
<PAGE>

                Selected Consolidated Financial Data of CapRock
                     (In thousands, except per share data)

<TABLE>
<CAPTION>
                                                            Six Months Ended
                                                                June 30,
                                                           -------------------
                                                             1999      2000
                                                           --------  ---------
<S>                                                        <C>       <C>
Statement of Operations Data:
  Revenues................................................ $ 74,596  $ 113,936
  Costs of Services.......................................   44,919     79,220
                                                           --------  ---------
      Gross profit........................................   29,677     34,716
  Operating expenses:
    Selling, general and administrative...................   25,012     43,398
    Merger related expenses...............................      --         --
    Depreciation and amortization.........................    3,337      9,077
                                                           --------  ---------
      Total operating expenses............................   28,349     52,475
                                                           --------  ---------
  Operating income (loss).................................    1,328    (17,759)
  Interest expense, net...................................   (7,134)    (7,021)
  Other income (expense)..................................     (135)        25
                                                           --------  ---------
  Income (loss) before income taxes and extraordinary
   item...................................................   (5,941)   (24,755)
  Income tax expense (benefit)............................   (2,335)    (9,118)
                                                           --------  ---------
  Income (loss) before extraordinary item.................   (3,606)   (15,637)
  Extraordinary item--extinguishment of debt..............      --         --
                                                           --------  ---------
      Net income (loss)................................... $  3,606  $ (15,637)
                                                           ========  =========
  Pro forma net income (loss):
    Income (loss) before income taxes and extraordinary
     item................................................. $ (5,941) $ (24,755)
    Pro forma income taxes, as if CapRock Fiber were a C
     corporation..........................................   (2,335)    (9,118)
                                                           --------  ---------
    Income (loss) before extraordinary item...............   (3,606)   (15,637)
    Extraordinary item, net of taxes......................      --         --
                                                           --------  ---------
      Pro forma net income (loss)......................... $ (3,606) $ (15,637)
                                                           ========  =========
  Historical and pro forma income (loss) per common share:
    Income (loss) before extraordinary item............... $  (0.12) $   (0.47)
    Extraordinary item, net of tax........................      --         --
                                                           --------  ---------
    Basic and diluted..................................... $  (0.12) $   (0.47)
                                                           ========  =========
  Weighted average shares outstanding:
    Basic.................................................   30,321     33,406
    Diluted...............................................   30,321     33,406
</TABLE>

                                       10
<PAGE>

                Selected Consolidated Financial Data of CapRock
                     (In thousands, except per share data)

<TABLE>
<CAPTION>
                               As of and for the Year Ended December 31,
                             -------------------------------------------------
                              1995      1996      1997      1998       1999
                             -------  --------  --------  ---------  ---------
<S>                          <C>      <C>       <C>       <C>        <C>
Balance Sheet Data:
  Working capital
   (deficit)................ $  (797) $ (2,153) $   (305) $ 102,489  $ 216,145
  Property, plant and
   equipment, net...........   6,705    15,901    27,341     59,607    228,601
  Total assets..............  13,198    28,522    49,389    191,966    548,835
  Long-term debt and capital
   lease obligations........   2,443    13,254    21,062    145,187    347,502
  Stockholders' equity......   3,552     3,886    14,086     16,062     96,030
Operating Data:
  EBITDA(1)................. $   896  $  2,630  $  8,804  $  15,025  $  20,412
  Cash flows provided by
   (used in) operations.....     827       781     4,112      7,125    (13,302)
  Cash flows used in
   investing activities.....  (1,919)   (9,350)  (12,987)  (134,350)  (264,623)
  Cash flows provided by
   financing activities.....     903     8,605    12,114    123,990    283,338
  Capital expenditures......  (2,282)  (10,212)  (13,631)   (36,855)  (201,289)
</TABLE>

<TABLE>
<CAPTION>
                                                           Six Months Ended
                                                               June 30,
                                                          --------------------
                                                            1999       2000
                                                          ---------  ---------
<S>                                                       <C>        <C>
Balance Sheet Data:
  Working capital (deficit).............................. $ 337,555  $ 104,312
  Property, plant and equipment, net.....................    97,360    423,039
  Total assets...........................................   479,533    676,174
  Long-term debt and capital lease obligations...........   347,012    348,218
  Stockholders' equity...................................    94,939    177,738
Operating Data:
  EBITDA(1).............................................. $  (4,665) $  (8,682)
  Cash flows provided by (used in) operations............   (14,897)    50,799
  Cash flows used in investing activities................  (258,169)  (159,910)
  Cash flows provided by financing activities............   283,872    107,113
  Capital expenditures...................................   (45,717)  (216,263)
</TABLE>
--------
(1) EBITDA consists of operating income or loss before interest, income taxes,
    depreciation and amortization and other nonrecurring operating expenses.
    EBITDA is a measure commonly used in the communications industry. EBITDA is
    not a measure of financial performance under generally accepted accounting
    principles and should not be considered as an alternative to net income as
    a measure of performance nor as an alternative to cash flow as a measure of
    liquidity.

                                       11
<PAGE>

                           Comparative Per Share Data

   The following table summarizes per share information for McLeodUSA and
CapRock on a historical, pro forma combined and equivalent pro forma basis. The
earnings per share were calculated using income (loss) from continuing
operations. The pro forma earnings per share amounts do not include any
adjustments to reflect potential expense reductions or revenue enhancements
that may result from the merger or the effect of repurchases of McLeodUSA Class
A common stock or CapRock common stock after the stated periods. The pro forma
data do not necessarily indicate the results of future operations or the actual
results that would have occurred had the merger occurred at the beginning of
the periods presented. The pro forma financial data have been included in
accordance with the rules of the SEC and are provided for comparative purposes
only. Options are not included in the computation of diluted earnings per share
for each company because the effect is anti-dilutive.

   The McLeodUSA pro forma earnings per share data include the adjusted
operations of CapRock for the year ended December 31, 1999 and the six months
ended June 30, 2000 and adjustments attributable to the acquisitions of Ovation
and Splitrock by McLeodUSA, the issuance by McLeodUSA of its 8 1/8% senior
notes, the issuance by McLeodUSA of its Series A, B and C preferred stock and
the completion by McLeodUSA of its Senior Secured Credit Facilities, as if such
transactions had occurred on January 1, 1999. The McLeodUSA "book value per
share at period end" data give effect to the acquisitions of Ovation and
Splitrock and the merger of CapRock as if they had occurred at the end of the
applicable periods.

   The CapRock "equivalent" pro forma amounts are calculated by multiplying the
unaudited McLeodUSA pro forma per share amounts by 0.3876. This exchange ratio
represents the number of shares of McLeodUSA Class A common stock that CapRock
stockholders would have received in exchange for each share of CapRock common
stock if the merger had been completed on October 2, 2000.

<TABLE>
<CAPTION>
                                             As of or for the  As of or for the
                                                Year Ended     Six Months Ended
                                             December 31, 1999  June 30, 2000
                                             ----------------- ----------------
                                                (unaudited)      (unaudited)
<S>                                          <C>               <C>
McLeodUSA Class A Common Stock
Loss attributable to shares of common stock
  Basic earnings per share
    Historical..............................      $ (0.54)         $ (0.40)
    Pro forma for the merger................        (0.99)           (0.54)
  Diluted earnings per share
    Historical..............................        (0.54)           (0.40)
    Pro forma for the merger................        (0.99)           (0.54)
  Book value per share at period end
    Historical..............................         1.74             4.48
    Pro forma for the merger................         4.85             4.69
CapRock Common Stock
Loss attributable to shares of common stock
  Basic earnings per share
    Historical..............................      $ (0.11)         $ (0.47)
    Equivalent pro forma....................        (0.38)           (0.21)
  Diluted earnings per share
    Historical..............................        (0.11)           (0.47)
    Equivalent pro forma....................        (0.38)           (0.21)
  Book value per share at period end
    Historical..............................         2.89             4.60
    Equivalent pro forma....................         1.88             1.82
</TABLE>

                                       12
<PAGE>

                            Comparative Market Data

   McLeodUSA. McLeodUSA Class A common stock is, and the shares of McLeodUSA
Class A common stock to be issued to CapRock stockholders are expected to be,
quoted on the Nasdaq National Market and traded under the symbol "MCLD." The
following table sets forth for the periods indicated the high and low sales
price per share of McLeodUSA Class A common stock as reported by the Nasdaq
National Market. Prices per share of McLeodUSA Class A common stock take into
account the two-for-one stock split in the form of a stock dividend effective
July 26, 1999 and the three-for-one stock split in the form of a stock dividend
effective April 24, 2000.

   CapRock. CapRock common stock is quoted on the Nasdaq National Market and
traded under the symbol "CPRK." CapRock common stock has been quoted on the
Nasdaq National Market since August 27, 1998. Before August 27, 1998, no
established public trading market for CapRock common stock existed. The
following table sets forth for the periods indicated the high and low sales
price per share of CapRock common stock as reported by the Nasdaq National
Market.

<TABLE>
<CAPTION>
                                                    McLeodUSA        CapRock
                                                 --------------- ---------------
                                                  High     Low    High     Low
                                                 ------- ------- ------- -------
<S>                                              <C>     <C>     <C>     <C>
1997
  First Quarter................................. $ 4.792 $ 2.896 $   --  $   --
  Second Quarter................................   5.708   2.729     --      --
  Third Quarter.................................   6.667   4.771     --      --
  Fourth Quarter................................   6.958   5.333     --      --
1998
  First Quarter................................. $ 7.729 $ 5.083 $   --  $   --
  Second Quarter................................   8.052   6.333     --      --
  Third Quarter.................................   6.688   3.563  10.000   6.375
  Fourth Quarter................................   6.417   2.542   8.750   4.750
1999
  First Quarter................................. $ 7.375 $ 5.063 $20.125 $ 7.250
  Second Quarter................................  10.313   7.063  41.625  18.250
  Third Quarter.................................  14.250   7.542  40.250  22.375
  Fourth Quarter................................  21.125  12.208  34.375  17.250
2000
  First Quarter................................. $35.938 $16.500 $58.500 $29.750
  Second Quarter................................  29.500  13.688  49.000  18.250
  Third Quarter.................................  25.125  10.500  20.125   3.469
  Fourth Quarter (through October 27, 2000).....  17.813  12.188   6.500   4.438
</TABLE>

   On October 2, 2000, the last full trading day before the public announcement
of the proposed merger, the closing price of McLeodUSA Class A common stock was
$13.063 per share and the closing price of CapRock common stock was $5.063 per
share. On October 27, 2000, the last trading day for which information was
available prior to the date of this proxy statement/prospectus, the closing
price reported for McLeodUSA Class A common stock was $17.625 per share and the
closing price reported for CapRock common stock was $6.375 per share.

   As of October 19, 2000, there were approximately 4,947 holders of record of
McLeodUSA Class A common stock and there were approximately 174 holders of
record of CapRock common stock.

   Dividends. McLeodUSA has never declared or paid a cash dividend with respect
to McLeodUSA Class A common stock, and CapRock has never declared or paid a
cash dividend with respect to its common stock. McLeodUSA does not anticipate
paying cash dividends on McLeodUSA Class A common stock in the foreseeable
future. The terms of some debt instruments of both McLeodUSA and CapRock limit
each company's ability to pay cash dividends.

                                       13
<PAGE>

                                 RISK FACTORS
   You should carefully consider the following risk factors relating to the
merger and to ownership of McLeodUSA Class A common stock. You should also
consider the other information in this proxy statement/prospectus, including
the SEC Reports on Forms 10-K, 10-Q and 8-K and in the other documents
considered a part of this proxy statement/prospectus. See "Where You Can Find
More Information."


The Value of the McLeodUSA Class A Common Stock CapRock Stockholders Will
Receive in the Merger Will Depend on Its Market Price at the Time of the
Merger.

   If the market price of McLeodUSA Class A common stock drops, the value of
the McLeodUSA Class A common stock a CapRock stockholder will receive as a
result of the merger will also drop, since the formula for converting CapRock
common stock into McLeodUSA Class A common stock uses a fixed exchange ratio
of 0.3876 of a share of McLeodUSA Class A common stock for each share of
CapRock common stock. See "Terms of the Merger Agreement and Related
Transactions--Conversion of CapRock Common Stock; Treatment of Options."

CapRock Directors and Executive Officers May Have Conflicts of Interest that
Influence Their Decision to Approve the Merger.

   You should be aware of potential conflicts of interest of, and the benefits
available to, CapRock directors and executive officers when considering the
recommendation of the CapRock board of directors of the merger agreement. As
discussed below under "The Merger--Interests of the CapRock Directors and
Executive Officers in the Merger," the CapRock directors and executive
officers have interests in the merger that are in addition to, or different
from, their interests as CapRock stockholders. These interests include:

  .  Options. Under the terms of CapRock's stock option plans, upon the
     completion of the merger, outstanding, non-vested options to purchase
     CapRock common stock held by CapRock directors and employees, including
     executive officers, will vest and become immediately exercisable.
     McLeodUSA will assume these options or issue substitute stock options to
     purchase McLeodUSA Class A common stock in replacement of all
     unexercised CapRock stock options outstanding at the effective time of
     the merger as described under "Terms of the Merger Agreement and Related
     Transactions--Conversion of CapRock Common Stock; Treatment of Options."

  .  Current Employment Agreements.  CapRock has entered into employment
     agreements with Jere W. Thompson, Jr., Leo J. Cyr, James E. Skinner and
     Timothy W. Rogers, each of whom is an executive officer of CapRock.
     Under these agreements, if the executive's employment with CapRock is
     terminated by CapRock without cause, as defined in the agreements, the
     executive is entitled to receive severance compensation and benefits as
     described under "The Merger--Interests of the CapRock Directors and
     Executive Officers in the Merger--Current Employment Agreements."

  .  Restricted Stock Agreements. CapRock has entered into restricted stock
     agreements with each of Messrs. Cyr and Skinner and Kenneth L. Monblatt,
     who is also an executive officer of CapRock. Under these agreements,
     upon the completion of the merger, restricted stock held by these
     officers is deemed to have become fully vested immediately prior to the
     merger. In addition, if the employment of Mr. Cyr or Mr. Skinner with
     CapRock is terminated by CapRock without cause, as defined in the
     agreements, the executive's restricted stock is deemed to have become
     fully vested immediately prior to such termination. See "The Merger--
     Interests of the CapRock Directors and Executive Officers in the
     Merger--Restricted Stock Agreements."

  .  Loan Agreement. CapRock has entered into a loan agreement with Mr. Cyr
     in connection with his employment agreement. Under this agreement, upon
     the completion of the merger, CapRock will fully forgive the principal
     amount and any

                                      14
<PAGE>

     unpaid accrued interest on this loan as described under "The Merger--
     Interests of the CapRock Directors and Executive Officers in the
     Merger--Loan Agreement."

  .  Grant of Option. Several CapRock directors, executive officers and other
     stockholders have entered into an agreement granting to McLeodUSA an
     option to purchase the shares of CapRock common stock owned by such
     stockholders under specified circumstances and terms as described under
     "The Merger--Interests of the CapRock Directors and Executive Officers
     in the Merger--Grant of Option" and "Terms of the Merger Agreement and
     Related Transactions--Grant of Option."

  .  Directors' and Officers' Insurance; Indemnification of CapRock Directors
     and Officers. Under the merger agreement, current and former CapRock
     directors and officers have significant rights to directors' and
     officers' insurance coverage and to indemnification with respect to acts
     and omissions in their capacities as CapRock directors and officers. See
     "The Merger--Interests of the CapRock Directors and Executive Officers
     in the Merger--Directors' and Officers' Insurance and Indemnification"
     and "Terms of the Merger Agreement and Related Transactions--Directors'
     and Officers' Insurance and Indemnification."

The Termination Fee, the Voting and Option Agreement and the Voting Agreement
May Discourage Other Companies from Trying to Acquire CapRock.

   In the merger agreement, CapRock agreed to pay a termination fee to
McLeodUSA in specified circumstances, including where a third party acquires or
seeks to acquire CapRock. Several CapRock stockholders beneficially owning an
aggregate of approximately 39% of the CapRock common stock outstanding on the
record date have entered into an agreement granting McLeodUSA an option to
purchase their shares of CapRock common stock. These options are exercisable
under similar circumstances as the payment of the termination fee. In addition,
CapRock stockholders beneficially owning an aggregate of approximately 52% of
the CapRock common stock outstanding on the record date have entered into
agreements with McLeodUSA whereby they have agreed to vote their shares in
favor of the approval of the merger agreement and against any competing
transaction. These agreements could discourage other companies from trying to
acquire CapRock even though those other companies might be willing to offer
greater value to CapRock stockholders than McLeodUSA has offered in the merger
agreement. In addition, payment of the termination fee could have an adverse
effect on CapRock's financial condition.

McLeodUSA May Not Be Able to Successfully Integrate Acquired Companies,
including CapRock, into Its Operations, Which Could Slow Its Growth.

   The integration of acquired companies, including the proposed acquisition of
CapRock, into the operations of McLeodUSA involves a number of risks,
including:

  .  difficulty integrating operations and personnel

  .  diversion of management attention

  .  potential disruption of ongoing business

  .  inability to retain key personnel

  .  inability to successfully incorporate acquired assets and rights into
     the service offerings of McLeodUSA

  .  inability to maintain uniform standards, controls, procedures and
     policies

  .  impairment of relationships with employees, customers or vendors

   Failure to overcome these risks or any other problems encountered in
connection with the merger or other similar transactions could slow the growth
of McLeodUSA or lower the quality of its services, which could reduce customer
demand and have a negative impact upon the price of the McLeodUSA Class A
common stock that CapRock stockholders receive in the merger.

                                       15
<PAGE>

Continued Rapid Growth of the McLeodUSA Network, Services and Subscribers Could
Be Slowed if McLeodUSA Cannot Manage this Growth.

   McLeodUSA has rapidly expanded and developed its network, services and
subscribers. This has placed and will continue to place, in part as a result of
the merger, significant demands on its management, operational and financial
systems and procedures and controls. McLeodUSA may not be able to manage its
anticipated growth effectively, which could harm its business, results of
operations and financial condition. Further expansion and development will
depend on a number of factors, including:

  .  cooperation of existing local telephone companies

  .  regulatory, legislative and other governmental developments

  .  changes in the competitive climate in which McLeodUSA operates

  .  development of customer billing, order processing and network management
     systems

  .  availability of financing

  .  technological developments

  .  availability of rights-of-way, franchises, building access and antenna
     sites

  .  existence of strategic alliances or relationships

  .  emergence of future opportunities

   McLeodUSA will need to continue to improve its operational and financial
systems and its procedures and controls as it grows. McLeodUSA must also
develop, train and manage its employees.

McLeodUSA Expects to Incur Significant Losses Over the Next Several Years.

   If McLeodUSA does not become profitable in the future, it could have
difficulty obtaining funds to continue its operations. McLeodUSA has incurred
net losses every year since it began operations. Since January 1, 1995,
McLeodUSA net losses applicable to common stock have been as follows:

<TABLE>
<CAPTION>
Period                                                               Amount
------                                                           --------------
<S>                                                              <C>
1995............................................................ $ 11.3 million
1996............................................................ $ 22.3 million
1997............................................................ $ 79.9 million
1998............................................................ $124.9 million
1999............................................................ $238.0 million
First 6 months of 2000.......................................... $211.4 million
</TABLE>

   McLeodUSA expects to incur significant operating losses during the next
several years while it develops its business and expands its fiber optic
communications network.

Failure to Raise Necessary Capital Could Restrict the Ability of McLeodUSA to
Develop Its Network and Services and Engage in Strategic Acquisitions.

   McLeodUSA needs significant capital to continue to expand its operations,
facilities, network and services including, following the merger, the expansion
and operation of CapRock. McLeodUSA cannot assure you that its capital
resources will permit it to fund its planned network deployment and operations
or achieve operating profitability. Failure to generate or raise sufficient
funds may require McLeodUSA to delay or abandon some of its expansion plans or
expenditures, which could harm its business and competitive position.

   As of June 30, 2000, based on the combined McLeodUSA and CapRock business
plans, capital requirements and growth projections as of that date, McLeodUSA
estimated that it would require approximately $1.7 billion through 2002 to fund
its planned capital expenditures and operating expenses. McLeodUSA expects to
meet these funding needs through the existing cash balances of McLeodUSA and
CapRock, the existing McLeodUSA lines of credit and income from future
operations. The estimated aggregate capital requirements of McLeodUSA include
the projected costs of:

  .  expanding its fiber optic communications network, including national and
     intra-city fiber optic networks

  .  adding voice and ATM switches

  .  expanding operations in existing and new markets

  .  developing wireless services in limited markets

                                       16
<PAGE>

  .  funding general corporate expenses

  .  completing recent acquisitions, including the merger

  .  constructing, acquiring, developing or improving telecommunications
     assets

   The McLeodUSA estimate of its future capital requirements is a "forward-
looking statement" within the meaning of the safe harbor provisions of the
Private Securities Litigation Reform Act of 1995. The actual amount and timing
of the future capital requirements of McLeodUSA may differ substantially from
its estimate due to factors such as:

  .  strategic acquisition costs and effects of acquisitions on its business
     plan, capital requirements and growth projections

  .  unforeseen delays

  .  cost overruns

  .  engineering design changes

  .  changes in demand for its services

  .  regulatory, technological or competitive developments

  .  new opportunities

   McLeodUSA also expects to evaluate potential acquisitions, joint ventures
and strategic alliances on an ongoing basis. McLeodUSA may require additional
financing if it pursues any of these opportunities.

   The projected funding plan of McLeodUSA assumes that (a) the indentures
governing the CapRock 12% senior notes due 2008 and 11 1/2% senior notes due
2009 are amended to provide that the acquisition of CapRock does not constitute
a change of control and (b) such notes will either remain outstanding as
amended to remove various covenants or be exchanged for a like principal amount
of notes of McLeodUSA pursuant to the terms of the exchange offers. See "Terms
of the Merger Agreement and Related Transactions--CapRock Debt Securities."

   McLeodUSA may meet any additional capital needs by issuing additional debt
or equity securities or borrowing funds from one or more lenders. McLeodUSA
cannot assure you that it will have timely access to additional financing
sources on acceptable terms. If it does not, McLeodUSA may not be able to
expand its markets, operations, facilities, network and services as it intends.
See "Information About McLeodUSA and Cactus Acquisition Corp."

The High Level of Debt of McLeodUSA Could Limit Its Flexibility in Responding
to Business Developments and Put It at a Competitive Disadvantage.

   McLeodUSA has substantial debt, which could adversely affect it in a number
of ways, including:

  .  limiting its ability to obtain necessary financing in the future

  .  limiting its flexibility to plan for, or react to, changes in its
     business

  .  requiring it to use a substantial portion of its cash flow from
     operations to pay debt rather than for other purposes, such as working
     capital or capital expenditures

  .  making it more highly leveraged than some of its competitors, which may
     place it at a competitive disadvantage

  .  making it more vulnerable to a downturn in its business

   As of June 30, 2000, McLeodUSA had $2.4 billion of long-term debt, including
$1.7 billion of debt under its senior notes and $575 million under its credit
facilities. It also had $1.0 billion of redeemable convertible preferred stock
and $2.9 billion of stockholders' equity. In addition, upon completion of the
merger and the exchange offers, McLeodUSA expects to have $360 million of long-
term debt resulting from the exchange of McLeodUSA notes for outstanding
CapRock notes. As a result, McLeodUSA expects its fixed charges to exceed its
earnings for the foreseeable future.

Covenants in Debt Instruments Restrict the Capacity of McLeodUSA to Borrow and
Invest, Which Could Impair Its Ability to Expand or Finance Its Operations.

   The indentures governing the terms of the long-term debt of McLeodUSA impose
operating and financial restrictions. In addition, under the terms of its
credit facilities, McLeodUSA has granted a security interest in substantially
all the assets of

                                       17
<PAGE>

McLeodUSA and its subsidiaries. These restrictions and encumbrances limit the
discretion of McLeodUSA in some business matters, which could make it more
difficult for McLeodUSA to expand, finance its operations or engage in other
business activities that may be in its interest. These restrictions limit or
prohibit the ability of McLeodUSA to:

  .  incur additional debt

  .  pay dividends or make other distributions

  .  make investments or other restricted payments

  .  enter into sale and leaseback transactions

  .  pledge, mortgage or permit liens upon assets

  .  enter into transactions with affiliates

  .  sell assets

  .  consolidate, merge or sell all or substantially all of its assets

If McLeodUSA fails to comply with these restrictions, all of its long-term debt
could become immediately due and payable.

The Ability of McLeodUSA to Pay Cash Dividends Is Restricted.

   McLeodUSA has never paid any cash dividends on shares of its Class A common
stock and it does not anticipate doing so for the foreseeable future. The
indentures and credit facilities governing the debt of McLeodUSA restrict
McLeodUSA from paying cash dividends. You should therefore not expect that cash
dividends will be paid on the shares of McLeodUSA Class A common stock you will
receive in the merger. In addition, you should be aware that the shares of
Series A preferred stock and Series B preferred stock of McLeodUSA carry rights
to receive a cumulative dividend before any cash dividend may be paid on the
McLeodUSA Class A common stock.

The Dependence of McLeodUSA on the MegaBells to Provide Most of Its
Communications Services Could Make it More Difficult for McLeodUSA to Offer Its
Services at a Profit.

   The original seven regional Bell operating companies that resulted from the
divestiture by AT&T in 1984 of its local telephone systems are now concentrated
into four large incumbent "MegaBells." McLeodUSA depends on these MegaBells to
provide most of its core local and some of its long distance services. Today,
without using the communications facilities of these companies, McLeodUSA could
not provide bundled local and long distance services to most of its customers.
Because of this dependence, the McLeodUSA communications services are highly
susceptible to changes in the conditions for access to these facilities and to
inadequate service quality provided by the MegaBells, and therefore McLeodUSA
may have difficulty offering its services on a profitable and competitive
basis.

   Qwest Communications International, Inc. (successor to U S WEST
Communications, Inc.) and SBC Communications Inc. (including its wholly-owned
subsidiary Ameritech Corporation) are the primary suppliers to McLeodUSA of
local lines to its customers and communications services that allow it to
transfer and connect calls. Upon completion of the merger, BellSouth will also
become a supplier to McLeodUSA. The communications facilities of the MegaBells
allow McLeodUSA to provide local service, long distance service and private
lines dedicated to its customers' use. If the MegaBells or other companies deny
or limit access by McLeodUSA to their communications network elements or
wholesale services, McLeodUSA may not be able to offer its communications
services at profitable rates.

   The McLeodUSA plan to provide local service using its own communications
network equipment also depends on the MegaBells. In order to interconnect its
network equipment and other communications facilities to network elements
controlled by the MegaBells, McLeodUSA must first negotiate and enter into
interconnection agreements with them. Interconnection obligations imposed on
the MegaBells by the Telecommunications Act of 1996 have been and continue to
be subject to a variety of legal proceedings, the outcome of which could affect
the ability of McLeodUSA to obtain interconnection agreements on acceptable
terms. McLeodUSA cannot assure CapRock stockholders that it will succeed in
obtaining interconnection agreements on terms that would permit it to offer
local services using its own communications network facilities at profitable
and competitive rates.
                                       18
<PAGE>

Actions by the MegaBells May Make it More Difficult for McLeodUSA to Offer Its
Communications Services.

   The MegaBells have pursued several measures that may make it more difficult
for McLeodUSA to offer its communications services. For example, in February
1996, U S WEST, which has since been acquired by Qwest, filed tariffs and other
notices with the public utility commissions in its fourteen-state service
region to limit future Centrex access to its switches. Centrex access allows
McLeodUSA to aggregate lines, have control over several characteristics of
those lines and provide a set of standard features on those lines. McLeodUSA
uses Qwest's Centrex services to provide most of its local communications
services in Qwest's service territories.

   In January 1997, U S WEST proposed interconnection surcharges in several of
the states in its service region, which would increase the costs incurred by
McLeodUSA in providing communications services in those states.

   In addition, during the past year Qwest filed proposals with the Iowa
Utilities Board to reduce the retail prices charged by Qwest for various
business services which, if approved, would have the effect of reducing the
margins of McLeodUSA on competitive local business services in Iowa.

   McLeodUSA has challenged or is challenging these actions before the FCC or
applicable state public utility commissions. McLeodUSA cannot assure you it
will succeed in its challenges to these or other actions by Qwest that would
prevent or deter McLeodUSA from using Qwest's Centrex service or communications
network elements. If Qwest successfully withdraws or limits access by McLeodUSA
to Centrex services in any jurisdiction, McLeodUSA may not be able to offer
communications services in that jurisdiction, which could harm its business.

   McLeodUSA anticipates that Qwest will also pursue legislation in states
within the McLeodUSA target market area to reduce state regulatory oversight
over its rates and operations. If adopted, these initiatives could make it more
difficult for McLeodUSA to challenge Qwest's actions in the future.

   SBC/Ameritech has also introduced measures that may make it more difficult
for McLeodUSA to offer certain types of communications services. For example,
in 1998 and 1999, Ameritech assessed extra special construction charges to
install service for customers when McLeodUSA leased a line from them. Ameritech
did not assess comparable charges to retail customers that ordered service
directly from SBC/Ameritech, which puts McLeodUSA at a disadvantage. McLeodUSA
has challenged or is challenging these actions by SBC/Ameritech before the
applicable state public utility commissions. Though McLeodUSA has succeeded in
three such challenges, it cannot assure CapRock stockholders that it will
succeed in its challenges to these or other actions by SBC/Ameritech that would
prevent or deter McLeodUSA from competing with them. If SBC/Ameritech can
successfully charge McLeodUSA extraordinary costs to install service when its
does not assess the same charges to retail customers, McLeodUSA may not be able
to offer communications services in that location, which would harm McLeodUSA's
business.

Competition in the Communications Services Industry Could Cause McLeodUSA to
Lose Customers and Revenue and Could Make it More Difficult for McLeodUSA to
Enter New Markets.

   McLeodUSA faces intense competition in all of its markets. This competition
could result in loss of customers and lower revenue for McLeodUSA. It could
also make it more difficult for McLeodUSA to enter new markets. Existing local
telephone companies, including Qwest, SBC/Ameritech, BellSouth and Verizon,
currently dominate their local telecommunications markets. Three major
competitors, AT&T, WorldCom and Sprint, dominate the long distance market.
Hundreds of other companies also compete in the long distance marketplace.
AT&T, WorldCom and Sprint also offer local telecommunications services in many
locations.

   The McLeodUSA local and long distance services also compete with the
services of other communications services companies competing with the existing
local telephone companies in some markets.

   Other competitors may include cable television companies, providers of
communications network facilities dedicated to particular customers,

                                       19
<PAGE>

microwave and satellite carriers, wireless telecommunications providers,
private networks owned by large end-users, and telecommunications management
companies.

   These and other firms may enter the markets where McLeodUSA focuses its
sales efforts, which may create downward pressure on the prices for its
services and negatively affect its returns. Many of the existing and potential
competitors of McLeodUSA have financial and other resources far greater than
those of McLeodUSA. In addition, the trend toward mergers and strategic
alliances in the communications industry may strengthen some of the competitors
of McLeodUSA and could put McLeodUSA at a significant competitive disadvantage.

If the MegaBells Are Allowed to Offer Bundled Local and Long Distance Services
in McLeodUSA Markets It Could Cause McLeodUSA to Lose Customers and Revenues
and Could Make It More Difficult for McLeodUSA to Enter New Markets.

   Presently the MegaBells are prohibited from offering interLATA long distance
services to customers in their regions until they have shown compliance with
the Telecommunications Act of 1996. The MegaBells are attempting to show
compliance and are seeking authority to offer in-region interLATA long distance
service. Southwestern Bell has obtained such authority in Texas.

   If the MegaBells, which have resources far greater than those of McLeodUSA,
are authorized to bundle interLATA long distance service and local service in
McLeodUSA markets before the MegaBells' local markets are effectively open to
competition, such an offering by the MegaBells could cause McLeodUSA to lose
customers and revenues and make it more difficult for it to compete in those
markets.

McLeodUSA May Not Succeed in Developing or Making a Profit from Wireless
Services.

   The McLeodUSA effort to offer wireless services involves a high degree of
risk and will impose significant demands on the management and financial
resources of McLeodUSA. Developing wireless services may require McLeodUSA to,
among other things, spend substantial time and money to acquire, build and test
a wireless infrastructure and enter into roaming arrangements with wireless
operators in other markets. The McLeodUSA business plan does not currently
include substantial funds for the development of wireless services. In order to
offer wireless services on a widespread basis, McLeodUSA would need to obtain
additional funding by issuing additional debt or equity securities or by
borrowing funds from one or more lenders. McLeodUSA may not succeed in
developing wireless services. Even if McLeodUSA spends substantial amounts to
develop wireless services, McLeodUSA may not make a profit from wireless
operations.

   The ability of McLeodUSA to successfully offer wireless services will also
depend on a number of factors beyond its control, including:

  .  changes in communications service rates charged by other companies

  .  changes in the supply and demand for wireless services due to
     competition with other wireline and wireless operators in the same
     geographic area

  .  changes in the federal, state or local regulatory requirements affecting
     the operation of wireless systems

  .  changes in wireless technologies that could render obsolete the
     technology and equipment McLeodUSA chooses for its wireless services

Competition in the Wireless Telecommunications Industry Could Make it More
Difficult for McLeodUSA to Successfully Offer Wireless Services.

   The wireless telecommunications industry is experiencing increasing
competition and significant technological change. This will make it more
difficult for McLeodUSA to gain a share of the wireless communications market.
McLeodUSA expects up to eight wireless competitors in each of its potential
target wireless markets. McLeodUSA could face additional competition from
mobile satellite services.

   Many of the potential wireless competitors of McLeodUSA have financial and
other resources far greater than those of McLeodUSA and have more experience
testing new or improved products and services. In addition, several wireless
competitors operate or plan to operate wireless telecommunications systems that
encompass most of the United States, which could give them a significant
competitive advantage, particularly if McLeodUSA offers only regional wireless
services.

                                       20
<PAGE>

The Success of the Communications Services of McLeodUSA Will Depend on the
Ability of McLeodUSA to Keep Pace with Rapid Technological Changes in Its
Industry.

   Communications technology is changing rapidly. These changes influence the
demand for the services of McLeodUSA. McLeodUSA needs to be able to anticipate
these changes and to develop new and enhanced products and services quickly
enough for the changing market. This will determine whether McLeodUSA can
continue to increase its revenue and number of subscribers and remain
competitive.

The Loss of Key Personnel Could Weaken the Technical and Operational Expertise
of McLeodUSA, Delay Its Introduction of New Services or Entry into New Markets
and Lower the Quality of Its Services.

   McLeodUSA may not be able to attract, develop, motivate and retain
experienced and innovative personnel. There is intense competition for
qualified personnel in the McLeodUSA lines of business. The loss of the
services of key personnel, or the inability to attract additional qualified
personnel, could cause McLeodUSA to make less successful strategic decisions,
which could hinder the introduction of new services or the entry into new
markets. McLeodUSA could also be less prepared for technological or marketing
problems, which could reduce its ability to serve its customers and lower the
quality of its services. As a result, the financial condition of McLeodUSA
could be adversely affected.

   The future success of McLeodUSA depends on the continued employment of its
senior management team, particularly Clark E. McLeod, the Chairman and Chief
Executive Officer of McLeodUSA, Stephen C. Gray, the President and Chief
Operating Officer of McLeodUSA and the President and Chief Executive Officer of
the Local Services operations of McLeodUSA, and Roy A. Wilkens, the Chief
Technology Officer of McLeodUSA and the President and Chief Executive Officer
of the Network and Data Services operations of McLeodUSA.

Failure to Obtain and Maintain Necessary Permits and Rights-of-Way Could Delay
Installation of McLeodUSA Networks and Interfere with Its Operations.

   To obtain access to rights-of-way needed to install its fiber optic cable,
McLeodUSA must reach agreements with state highway authorities, local
governments, transit authorities, local telephone companies and other
utilities, railroads, long distance carriers and other parties. The failure to
obtain or maintain any rights-of-way could delay planned McLeodUSA network
expansion, interfere with its operations and harm its business. For example, if
McLeodUSA loses access to a right-of-way, it may need to spend significant sums
to remove and relocate its facilities.

Government Regulation May Increase the Cost to McLeodUSA of Providing Services,
Slow Its Expansion into New Markets and Subject Its Services to Additional
Competitive Pressures.

   McLeodUSA facilities and services are subject to federal, state and local
regulations. The time and expense of complying with these regulations could
slow down the expansion by McLeodUSA into new markets, increase its costs of
providing services and subject it to additional competitive pressures. One of
the primary purposes of the Telecommunications Act of 1996 was to open the
local telephone services market to competition. While this has presented
McLeodUSA with opportunities to enter local telephone markets, it also provides
important benefits to the existing local telephone companies, such as the
ability, under specified conditions, to provide out-of-region long distance
service to customers in their respective regions. In addition, McLeodUSA needs
to obtain and maintain licenses, permits and other regulatory approvals in
connection with some of its services. Any of the following could harm the
business of McLeodUSA:

  .  failure to maintain proper federal and state tariffs

  .  failure to maintain proper state certifications

  .  failure to comply with federal, state or local laws and regulations

  .  failure to obtain and maintain required licenses and permits

  .  burdensome license or permit requirements to operate in public rights-
     of-way

  .  burdensome or adverse regulatory requirements

  .  delays in obtaining or maintaining required authorizations

                                       21
<PAGE>

Management and Principal Stockholders of McLeodUSA Have Significant Ownership
of McLeodUSA and May Have Different Interests Than Those of Other Stockholders.

   Alliant Energy Corporation, M/C Investors L.L.C., Media/Communications
Partners III Limited Partnership, Richard Lumpkin and various trusts for the
benefit of his family, Clark and Mary McLeod, and the directors and executive
officers of McLeodUSA beneficially owned approximately 26% of the outstanding
McLeodUSA Class A common stock as of September 30, 2000. These stockholders may
have substantial influence over management policy and many corporate actions
requiring a stockholder vote, including election of the board of directors.
Conflicts of interest may arise between the interests of these stockholders and
other stockholders of McLeodUSA. For example, the fact that these stockholders
hold so much McLeodUSA Class A common stock could make it more difficult for a
third party to acquire McLeodUSA. You should expect these stockholders to
resolve any conflicts in their favor.

Preferred Stockholders May Have Competing Interests.

   Holders of McLeodUSA preferred stock have the ability to convert their
shares into approximately 112 million shares of McLeodUSA Class A common stock.
Potential conflicts of interest may arise between holders of McLeodUSA Class A
common stock and holders of McLeodUSA preferred stock with respect to, among
other things, the payment of dividends, conversion rights, asset dispositions
or liquidation matters, and operation and financial decisions of the McLeodUSA
board of directors. In addition, the holders of McLeodUSA preferred stock have
class voting rights on specified actions requiring McLeodUSA stockholder
approval.

Secondary Sales of McLeodUSA Class A Common Stock in the Public Market Could
Adversely Affect Its Stock Price.

   The market price of McLeodUSA Class A common stock may fluctuate or decline
significantly in the future as a consequence of sales by either existing
holders of McLeodUSA Class A common stock or existing holders of McLeodUSA
preferred stock who convert their shares into shares of McLeodUSA Class A
common stock.

   As of September 30, 2000, there were outstanding:

  .  585,128,506 shares of McLeodUSA Class A common stock

  .  1,149,580 shares of McLeodUSA Series A preferred stock convertible into
     29,658,923 shares of McLeodUSA Class A common stock

  .  400,000 shares of McLeodUSA Series B and Series C preferred stock
     convertible into 82,191,777 shares of McLeodUSA Class A common stock,
     all of which shares of Series B and Series C preferred stock are held by
     three partnerships affiliated with Forstmann Little & Co.

  .  options to purchase 132,589,350 shares of McLeodUSA Class A common stock

  .  153,946,555 shares of McLeodUSA Class A common stock beneficially owned
     by Alliant Energy, M/C Investors, Media/Communications Partners III,
     Richard Lumpkin and various trusts for the benefit of his family, Clark
     and Mary McLeod, and the directors and executive officers of McLeodUSA,
     all of which shares were eligible for sale in the public market either
     in accordance with Rule 144 under the Securities Act or otherwise

  .  options held by Alliant Energy to purchase 7,804,128 shares of McLeodUSA
     Class B common stock convertible into 7,804,128 shares of McLeodUSA
     Class A common stock

   After the merger, approximately 15.1 million additional shares of McLeodUSA
Class A common stock issued to the former stockholders of CapRock will be
outstanding, as well as options to purchase approximately an additional 2.7
million shares of McLeodUSA Class A common stock. These options generally will
be fully exercisable upon completion of the merger.

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<PAGE>

              CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

   This proxy statement/prospectus and the information incorporated by
reference in it include "forward-looking statements" within the meaning of
Section 27A of the Securities Act and Section 21E of the Securities Exchange
Act. McLeodUSA and CapRock intend the forward-looking statements to be covered
by the safe harbor provisions for forward-looking statements in these sections.
All statements regarding our expected financial position and operating results,
our business strategy, our financing plans, our future capital requirements,
forecasted demographic and economic trends relating to our industry, our
ability to complete acquisitions, including the merger of CapRock with a
subsidiary of McLeodUSA, to realize anticipated cost savings and other benefits
from acquisitions and to recover acquisition-related costs, and similar matters
are forward-looking statements. These statements are subject to known and
unknown risks, uncertainties and other factors that could cause events or our
actual results to differ materially from the statements. The forward-looking
information is based on various factors and was derived using numerous
assumptions. In some cases, you can identify these statements by our use of
forward-looking words such as "may," "will," "should," "anticipate,"
"estimate," "expect," "plan," "believe," "predict," "potential" or "intend."
You should be aware that these statements only reflect our predictions. Actual
events or results may differ substantially. Important factors that could cause
events or our actual results to be materially different from our expectations
include those discussed in this proxy statement/prospectus under the caption
"Risk Factors" and those discussed in documents incorporated by reference in
this proxy statement/prospectus. We undertake no obligation to update or revise
publicly any forward-looking statements, whether as a result of new
information, future events or otherwise.

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<PAGE>

                              THE SPECIAL MEETING

   This proxy statement/prospectus is first being mailed or delivered by
CapRock to its stockholders on or about November 2, 2000 in connection with the
solicitation of proxies by the CapRock board of directors for use at the
special meeting and at any adjournments or postponements of the special
meeting. This document is also a prospectus for the McLeodUSA Class A common
stock to be issued in the merger. You should read this document carefully
before voting your shares.

Date, Time and Place; Matters to be Considered

   The special meeting will be held on December 5, 2000 at 9:00 a.m., local
time at the offices of CapRock located at 15601 Dallas Parkway, Suite 700,
Dallas, Texas 75001. At the special meeting, CapRock stockholders will be asked
to consider and vote on a proposal to approve the Agreement and Plan of Merger,
by and among McLeodUSA Incorporated, Cactus Acquisition Corp., a wholly-owned
subsidiary of McLeodUSA Incorporated, and CapRock Communications Corp., dated
as of October 2, 2000.

   The approval of this proposal is required in order for CapRock to complete
the merger.

Proxies

   The accompanying form of proxy is for the use of CapRock stockholders to
allow them to vote at the special meeting if they cannot or do not wish to
attend and vote in person. A CapRock stockholder may revoke a previously
granted proxy at any time before it is exercised, by submitting to the
Corporate Secretary of CapRock written notice of revocation or a properly
executed proxy with a later date, or by attending the special meeting and
voting in person.

   Written notices of revocation and other communications with respect to the
revocation of proxies should be addressed to CapRock Communications Corp.,
15601 Dallas Parkway, Suite 700, Dallas, Texas 75001, Attention: Corporate
Secretary. All shares represented by valid proxies received and not revoked
before they are exercised will be voted in the manner specified in such
proxies. If no specification is made, such shares will be voted in favor of the
proposal to approve the merger agreement.

   The CapRock board of directors is not currently aware of any other matters
which will come before the special meeting. If any other matter is presented at
the special meeting for action, the persons named in the accompanying proxy
card will vote the proxy in their own discretion.

Solicitation of Proxies

   McLeodUSA and CapRock have agreed to share equally all expenses incurred in
connection with the filing, printing and mailing of this proxy
statement/prospectus. Other than these expenses, CapRock will bear the entire
cost of soliciting proxies from CapRock stockholders. In addition to soliciting
proxies by mail, CapRock will request banks, brokers and other record holders
to send proxies and proxy material to the beneficial owners of CapRock common
stock and to secure their voting instructions. CapRock will reimburse such
record holders for their reasonable expenses in so doing. CapRock intends to
use several of its officers and regular employees, who will not be specially
compensated, to solicit proxies from stockholders, either personally or by
telephone, telegram, facsimile or electronic or United States mail.

Record Date and Voting Rights

   The CapRock board of directors has selected the close of business on October
19, 2000 as the record date for the special meeting. Under Texas law and the
bylaws of CapRock, only holders of record of shares of CapRock common stock on
the record date will be entitled to notice of and to vote at the special
meeting. 38,729,536 shares of CapRock common stock are entitled to vote at the
special meeting. On the record date, there were approximately 174 record
holders of CapRock common stock.

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<PAGE>

   Each share of CapRock common stock entitles its holder to one vote. The
affirmative vote of at least a majority of the outstanding shares of CapRock
common stock is required to approve the merger agreement. The approval of the
merger agreement is required in order for CapRock to complete the merger.

   While there is no definitive statutory or case law authority in Texas as to
the proper treatment of abstentions, CapRock believes that abstentions should
be counted for purposes of determining the presence or absence of a quorum for
the transaction of business. In the absence of controlling precedent to the
contrary, CapRock intends to treat abstentions in this manner. Brokers who hold
shares of CapRock common stock in nominee or street name for customers who are
the beneficial owners of such shares are prohibited from giving a proxy to vote
shares held for these customers with respect to the matters to be voted upon at
the special meeting without specific instructions from these customers. Broker
non-votes will not be counted for purposes of determining the presence or
absence of a quorum for the transaction of business. Because the affirmative
vote of at least a majority of the outstanding shares of CapRock common stock
is required to approve the merger agreement, abstentions and broker non-votes
will have the same effect as a vote against the proposal to approve the merger
agreement.

   Several directors, executive officers and stockholders of CapRock entered
into agreements by which they have agreed to vote their shares in favor of the
approval of the merger agreement. The 19,979,230 shares of CapRock common stock
subject to these agreements represent approximately 52% of the outstanding
shares entitled to vote at the special meeting.

   In accordance with the terms of the agreements referenced above, CapRock is
assured of receiving the requisite votes in favor of the approval of the merger
agreement.

Recommendation of the CapRock Board of Directors

   The CapRock board of directors has determined that the merger agreement and
the merger are fair and in the best interests of CapRock and its stockholders.
The CapRock board of directors recommends that the CapRock stockholders vote
"FOR" the approval of the merger agreement. See "The Merger--Recommendation of
the CapRock Board of Directors and Reasons for the Merger."

                                       25
<PAGE>

                                   THE MERGER

Background of the Merger

   Both McLeodUSA and CapRock regularly evaluate different strategies to
improve their competitive positions and enhance their respective stockholder
values, including opportunities for acquisitions of other companies or their
assets, possible partnerships or alliances and other significant transactions.

   CapRock became more focused on this process and accelerated its efforts
after CapRock's announcement on July 6, 2000 that its revenues, gross margins,
EBITDA and earnings per share for the quarter ended June 30, 2000 would be
significantly below analysts' expectations.

   The board of directors of CapRock held a telephonic meeting on July 28, 2000
during which management made a presentation with respect to the financial
position of CapRock and the availability of capital. The board authorized
management to seek sources of financing including completion, if possible, of a
secured credit facility from The Chase Manhattan Bank. From July 28, 2000
through September 22, 2000, the CapRock board of directors met seven times to
discuss the operations and cash position of CapRock, its progress with respect
to obtaining financing, private investors and strategic alternatives.

   In early August 2000, in addition to its own efforts, CapRock asked Chase
Securities, Inc. to renew the efforts Chase Securities had undertaken earlier
in the year to seek private financial investors. In addition, on August 16,
2000, CapRock engaged Salomon Smith Barney to solicit interest in strategic
alternatives, as well as to solicit interest for private equity financings.
Salomon Smith Barney contacted a number of potential strategic and financial
investors. This process ultimately narrowed to three proposals (including the
proposal from McLeodUSA as described below), which were carefully considered
and explored by CapRock's board of directors.

   In early September 2000, representatives from Salomon Smith Barney worked
with representatives from McLeodUSA to arrange an introductory meeting between
McLeodUSA and CapRock. On September 12, 2000, McLeodUSA and CapRock executed a
confidentiality agreement.

   On September 13, 2000, Blake O. Fisher, Jr., Group Vice President of
Corporate Development for McLeodUSA, along with three other members of the
McLeodUSA management team, traveled to the CapRock corporate headquarters in
Dallas, Texas, for an introductory meeting. Jere W. Thompson, Jr., Chairman of
the Board of Directors and Chief Executive Officer of CapRock, along with
certain of CapRock's key officers, provided an overview of CapRock to
McLeodUSA. During this meeting, Messrs. Fisher and Thompson discussed whether a
business combination between McLeodUSA and CapRock might be mutually beneficial
and agreed to continue their discussions. In a subsequent telephone
conversation, Messrs. Fisher and Thompson scheduled a follow-up meeting to be
held in Cedar Rapids, Iowa, on September 21, 2000.

   On September 21, 2000, Mr. Thompson, Leo J. Cyr, President and Chief
Operating Officer of CapRock, and Mark Langdale, a member of the board of
directors of CapRock, met with key members of the McLeodUSA management team in
Cedar Rapids. During this meeting, Stephen C. Gray, President and Chief
Operating Officer of McLeodUSA and President and Chief Executive Officer of
Local Services operations, expressed to Mr. Thompson an interest in continuing
discussions regarding a strategic business combination of McLeodUSA and
CapRock.

   On the morning of September 22, 2000, the CapRock board of directors held a
meeting during which James E. Skinner, the Chief Financial Officer of CapRock,
discussed the cash position of CapRock. Mr. Thompson updated the board of
directors on the status of discussions with respect to each of the three
proposals for strategic alternatives and the status of obtaining a credit
facility.

   Later in the day, on September 22, 2000, Mr. Fisher expressed to Mr.
Thompson the interest of McLeodUSA in acquiring CapRock in order to expand
McLeodUSA's markets. Mr. Fisher did not propose any

                                       26
<PAGE>

specific terms of the transaction, although he and Mr. Thompson discussed
general price and structure terms of a potential business combination,
including the form of consideration to be received by the CapRock stockholders.
Messrs. Fisher and Thompson each indicated the respective price levels at which
their companies might be interested in proceeding with a transaction. On the
evening of September 22, 2000, Mr. Fisher sent Mr. Thompson a list of critical
parameters for the continued interest in CapRock by McLeodUSA. Over the weekend
of September 23-24, 2000, Messrs. Fisher and Thompson continued their
discussions, and Mr. Fisher indicated a willingness on the part of McLeodUSA to
execute a definitive agreement with respect to the transaction within seven
days.

   The CapRock board of directors met on September 25, 2000 to discuss the
interest of McLeodUSA and the parameters of that interest, as well as other
alternative financial and strategic opportunities for CapRock. Salomon Smith
Barney led a discussion with respect to each of the strategic alternatives
being considered by CapRock. Mr. Thompson received direction from the CapRock
board of directors to continue discussions and due diligence with McLeodUSA and
to seek additional information and enhanced terms from each of the proponents
of the strategic alternatives being considered. During the week of September
25, 2000, each of the proponents of the strategic alternatives was contacted
and McLeodUSA and one other proponent each agreed to enhance their proposals.
Representatives of McLeodUSA also agreed to come to Dallas to commence their
due diligence review, as well as the preparation of documentation with respect
to a possible transaction.

   During the evening of September 27, 2000, McLeodUSA's legal counsel sent
CapRock's legal counsel drafts of a merger agreement together with related
agreements.

   On September 28, 2000, Mr. Fisher and Randall Rings, Group Vice President
and Chief Legal Officer for McLeodUSA, along with a select group from
McLeodUSA, began meetings with CapRock to discuss issues to be resolved in
order to complete the definitive documents for the transaction and to conduct
an extensive review of the operations, business, accounting, financial position
and legal matters of one another. This process continued until execution of the
definitive merger agreement and related agreements on October 2, 2000.

   During the afternoon of September 28, 2000, Messrs. Thompson and Langdale,
together with CapRock's internal legal advisors, met with Mr. Fisher and Tracy
A. Millard, Vice President of Mergers and Acquisitions for McLeodUSA, together
with McLeodUSA's internal legal advisors, to negotiate the principal terms of
the proposed transaction, including, among other things, (1) the proposed
voting and option agreement and voting agreement, (2) the proposed
representations and warranties to be made under, and the conditions to the
closing of, the merger agreement, including the condition that CapRock
noteholders consent to amendments to CapRock's outstanding notes, (3) operating
covenants between the signing of the definitive merger agreement and the
closing of the transaction, (4) the negotiation of acceptable arrangements to
provide financing for CapRock through May 2001 even if the merger agreement was
terminated and (5) employee stock options. McLeodUSA conditioned its proceeding
with the transaction with CapRock on (1) receiving voting agreements from
CapRock stockholders owning more than 50% of the shares of CapRock common stock
requiring them to vote for the transaction and against competing transactions,
(2) receiving option agreements from each of Messrs. Thompson and Langdale and
Jere W. Thompson, Sr., or related individuals or affiliated entities, granting
McLeodUSA the right under certain circumstances to purchase their shares of
CapRock common stock, representing approximately 39% of the outstanding common
stock of CapRock, (3) receiving consents from CapRock noteholders to amendments
to CapRock's outstanding notes and (4) there being no termination provisions in
the merger agreement for superior proposals. CapRock conditioned its proceeding
with the transaction with McLeodUSA on (1) entering into arrangements
satisfactory to CapRock to provide funding for CapRock through May 2001 and (2)
satisfactory operating covenants between signing and closing.

   Throughout the period from the evening of September 28, 2000 to the signing
of the definitive merger agreement on October 2, 2000, Messrs. Thompson and
Fisher, and the respective financial and legal advisors for CapRock and
McLeodUSA, held numerous conversations, reviewed drafts of the merger agreement
and related agreements, and negotiated various terms of the transaction and
provisions of the agreements. This

                                       27
<PAGE>

process involved representatives of Salomon Smith Barney and Munsch Hardt Kopf
& Harr, P.C. on behalf of CapRock, and representatives of Goldman Sachs & Co.
and Cravath, Swaine & Moore on behalf of McLeodUSA.

   During the afternoon of October 1, 2000, the board of directors of McLeodUSA
held a special meeting to hear a report from its senior management on the
status and proposed terms of the transaction.

   Also during the afternoon of October 1, 2000, the CapRock board of directors
held a special meeting. Mr. Thompson briefed the board on the status of the
negotiations with McLeodUSA and one of the other proponents of a strategic
transaction. Together with CapRock's financial advisor and legal counsel, the
board reviewed and considered the strategic rationale for the proposed business
combination with McLeodUSA, other alternatives available to CapRock, and their
fiduciary duties and responsibilities to the CapRock stockholders with respect
to proposed business combinations. At this meeting, the CapRock board of
directors determined to hold another meeting later in the evening of October 1,
2000 for an update on any developments during the day. The board also requested
that the proponent of a proposal for a strategic transaction other than
McLeodUSA, which had previously agreed to enhance its proposal, be contacted to
arrange a meeting on Monday, October 2, 2000.

   On the evening of October 1, 2000, the CapRock board of directors held a
special meeting. Mr. Thompson updated the board on the status of the
negotiations with McLeodUSA and one of the other proponents of a strategic
transaction.

   On October 2, 2000, McLeodUSA presented to CapRock a revised draft of a
proposed merger agreement, together with related agreements. CapRock identified
to McLeodUSA a list of issues to be resolved in order to proceed with the
transaction, including the form of financing proposed by McLeodUSA, the terms
of the proposed option and voting agreement and the proposed voting agreement,
and specific provisions in the draft merger agreement relating to
representations and warranties.

   On the afternoon of October 2, 2000, Mr. Thompson met with Mr. Fisher to
determine whether each party would be able to meet the other's conditions for
proceeding with the proposed transaction. During this meeting, Messrs. Thompson
and Fisher were able to agree on, among other things, the exchange ratio, the
principal terms of the option and voting agreement and the voting agreement, as
such agreements affected CapRock, and the operating covenants between signing
and closing. Throughout the day on October 2, 2000, senior management of both
companies, together with their respective financial and legal advisors,
continued to negotiate the principal terms of a credit agreement between
CapRock and The Chase Manhattan Bank and discussed entering into an
indefeasible right of use (IRU) agreement for McLeodUSA to purchase fiber from
CapRock.

   Throughout the day and evening of October 2, 2000, representatives of the
two companies and their respective advisors negotiated the final terms of the
merger agreement and related agreements and completed their due diligence
analyses.

   The CapRock board of directors held a special meeting in the afternoon of
October 2, 2000. Mr. Skinner provided a report which listed the cash on hand
and projected the sources and uses of cash for the next several months. Mr.
Skinner discussed the report with the directors and responded to inquiries from
the directors. Mr. Langdale reported on the results of his meeting that day
with the proponent of the other strategic alternative. Following Mr. Langdale's
report, the CapRock board of directors, together with CapRock's financial
advisor and legal counsel, reviewed the final terms of each of the proposed
transactions. Munsch Hardt Kopf & Harr, P.C. made a presentation to the board
regarding the fiduciary duties and responsibilities of the directors, the
material terms and conditions of the final merger agreement, the voting and
option agreement, the voting agreement, CapRock noteholder issues and updated
the board on how the key remaining legal issues had been resolved. Michael
Donohoe, in-house counsel for CapRock, made a presentation on the terms of the
credit agreement. Salomon Smith Barney presented the final results of its
financial and valuation analyses of CapRock

                                       28
<PAGE>

and McLeodUSA and the proposed transaction, as well as analyses of other
strategic alternatives potentially available to CapRock. Salomon Smith Barney
delivered its oral opinion, later confirmed in writing, that as of October 2,
2000, the exchange ratio was fair, from a financial point of view, to the
CapRock stockholders. After further discussion and due consideration, the
CapRock board of directors approved the merger agreement, the credit agreement
and the other matters contemplated by these agreements, recommended that the
merger agreement be approved by the CapRock stockholders and directed that the
merger agreement be submitted to the CapRock stockholders for approval.

   Also during the afternoon of October 2, 2000, the McLeodUSA board of
directors held a special meeting. At the meeting, the McLeodUSA board of
directors received a presentation from senior management on the material terms
and conditions of the merger agreement, the voting and option agreement, the
voting agreement and the credit agreement and the other matters contemplated by
these agreements. The McLeodUSA board of directors also heard an update from
its management, financial advisor and legal advisors on how certain of the
remaining open issues had been resolved. The McLeodUSA board of directors
discussed the information presented by senior management and by its financial
advisor. After discussion and due consideration, the McLeodUSA board of
directors approved the merger agreement and related agreements and the credit
agreement and related agreements.

   McLeodUSA and CapRock issued a joint press release to announce the execution
of the definitive merger agreement and the related agreements before the Nasdaq
National Market opened on the morning of October 3, 2000.

Recommendation of the CapRock Board of Directors and Reasons for the Merger

   The CapRock board of directors has determined that the terms of the merger
agreement and the merger are fair to and in the best interests of CapRock and
its stockholders. The CapRock board of directors has approved the merger
agreement, recommended that the merger agreement be approved by the CapRock
stockholders and directed that the merger agreement be submitted to the CapRock
stockholders for approval. The CapRock board of directors recommends that
CapRock stockholders vote "FOR" the approval of the merger agreement.

   In reaching its determination to approve the transaction and to recommend
that the CapRock stockholders vote to approve the merger agreement, the CapRock
board identified several potential benefits for CapRock and its stockholders,
including:

  .  CapRock stockholders will have the opportunity to participate in the
     potential for growth of the combined company after the merger

  .  McLeodUSA is more diversified and has a significantly larger market
     capitalization than CapRock; as a result, CapRock stockholders who
     exchange their CapRock common stock for McLeodUSA Class A common stock
     in the merger may obtain a more liquid investment

  .  the combined management teams will allow CapRock's recently enhanced
     management team to work with McLeodUSA's recognized management to
     accelerate the growth and progress of the combined business

  .  as a result of the strategic fit between the CapRock and McLeodUSA
     operations, the merger provides the opportunity to create a super-
     regional telecommunications company that will combine CapRock's
     Southwestern presence with McLeodUSA's Midwestern and Rocky Mountain
     presence and will have the ability to bundle basic local and long
     distance telephone services with advanced broadband voice, video and
     data communications services

  .  the combined company will have the opportunity to realize significant
     synergies by leveraging the combined company's network to reduce local
     access charges, wholesale carriage costs and operating costs and take
     advantage of potentially significant growth in data traffic


                                       29
<PAGE>

  .  the integrated products and services offerings of the combined company
     will create and enhance cross-selling opportunities to the existing
     customer bases of each of CapRock and McLeodUSA, resulting in new
     opportunities to generate revenue

  .  as part of McLeodUSA, CapRock will benefit from substantially greater
     financial and sales and marketing resources and will be better able to
     compete in the highly competitive market for telecommunications services

  .  the financial resources and access to capital of McLeodUSA, together
     with the interim financing which CapRock received in connection with the
     announcement of the merger, will allow CapRock to continue its
     operations and business plan

  .  the merger is expected to be tax free to CapRock's U.S. stockholders
     (except to the extent they receive cash for any fractional shares)

   The CapRock board consulted with CapRock senior management, as well as its
financial advisor, independent accountants and legal counsel, in reaching its
decision to approve the merger agreement. Among the factors the CapRock board
considered in its deliberations were the following:

  .  the benefits described above

  .  the familiarity of the CapRock board with CapRock's cash position,
     difficulties in accessing capital, business, properties and prospects of
     CapRock, including the opportunities and acquisition alternatives
     available to CapRock if the proposed merger did not occur

  .  the exchange ratio negotiated with McLeodUSA and the recent and
     historical market prices of CapRock common stock, as well as how this
     exchange ratio compared to the other opportunities available to CapRock
     and the value achievable upon a liquidation of CapRock

  .  the opinion of Salomon Smith Barney that, as of October 2, 2000, the
     exchange ratio was fair, from a financial point of view, to the CapRock
     stockholders (a copy of Salomon Smith Barney's opinion is attached as
     Appendix D to this proxy statement/prospectus)

  .  information and presentations by CapRock management and legal and
     financial advisors concerning the business, technology, products,
     operations, financial condition, organizational structure and industry
     position of CapRock and McLeodUSA, on both an historical and prospective
     basis

  .  current financial market conditions and historical market prices,
     volatility and trading information about CapRock common stock and
     McLeodUSA Class A common stock

  .  the potential benefits of the merger to CapRock's customers, suppliers
     and employees

  .  the terms and conditions of the merger agreement

  .  the terms and conditions of the voting agreement of various stockholders
     of CapRock, who own approximately 52% of the outstanding CapRock common
     stock, which requires them to vote such shares in favor of the merger
     agreement

  .  the terms and conditions of the option agreement of various stockholders
     of CapRock, granting McLeodUSA an option to purchase up to approximately
     39% of the outstanding CapRock common stock under specified
     circumstances

  .  the completion by McLeodUSA of its due diligence and willingness to
     execute a definitive agreement and commitment to completion of the
     transaction on an expedited basis

   Prior to reaching a decision to recommend that the merger agreement be
approved by the stockholders of CapRock, the CapRock board of directors, with
the assistance of Salomon Smith Barney and legal counsel, considered a number
of strategic alternatives, including (1) a sale of a significant minority
preferred equity investment in CapRock to a strategic investor, (2) a
combination with a private entity through the contribution of that entity's
assets to CapRock in return for a significant majority equity interest in
CapRock, (3) obtaining a

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<PAGE>

secured credit facility, (4) sales of significant assets, including large
amounts of its fiber network and (5) the likelihood of obtaining additional
alternatives after evaluating the results of the marketing process conducted by
Salomon Smith Barney and Chase Securities.

   During the third quarter of 2000, Salomon Smith Barney contacted numerous
potential investors to solicit interest in strategic alternatives, as well as
to solicit interest for private equity financings with CapRock. In addition,
Chase Securities renewed its efforts, which it had begun earlier in the year,
to seek potential private investors. In addition, CapRock both sought and
received contacts from additional parties with regard to credit facilities,
large indefeasible right of use sales, private equity transactions and
strategic alternatives. This process narrowed to three proposals for a
strategic transaction and a separate proposal for secured credit financing.

   The proposed merger provided the most certainty for completion of a
transaction in the shortest period of time, which the CapRock board of
directors believed was significant in light of the immediate and long-term
capital needs of CapRock. In addition to other issues associated with the other
alternatives being considered, the time to execution of a definitive agreement
with any party other than McLeodUSA was expected to take several weeks. During
those weeks, CapRock would be exposed to potentially negative and unacceptable
liquidity and market risks. Those risks could be negatively affected by
reactions to the expiration of the Chase Manhattan credit facility commitment,
differing perceptions of operational results for the third quarter, payment
demands from creditors, employee recruiting and retention issues, marketing
challenges with customers and competitors due to unfavorable publicity, and the
difficulties being faced by other competitive local exchange companies in the
capital markets.

   The CapRock board of directors also identified and considered a variety of
potentially negative factors in its deliberations concerning the merger
agreement, including the following:

  .  the risk that the per share value of the consideration to be received in
     the merger could decline significantly from the value immediately prior
     to the announcement of the merger, because the exchange ratio will not
     be adjusted for changes in the market price of CapRock common stock or
     McLeodUSA Class A common stock

  .  the possibility that the merger might not be consummated due to a
     party's failure to satisfy conditions to closing, including the
     condition that CapRock noteholders consent to amendments to CapRock's
     outstanding notes

  .  the potential adverse effects of the failure to consummate the merger on
     CapRock's operating results, the ability of CapRock to implement its
     business plan and the overall competitive position and prospects of
     CapRock

  .  the inability for a third-party acquisition proposal to become effective
     because of the stock option and voting agreements described above and
     the termination provisions of the merger agreement

  .  the inability of CapRock to terminate the merger agreement for a
     superior proposal

  .  the risk that the potential benefits of the merger may not be realized

  .  other applicable risks described in this proxy statement/prospectus
     under "Risk Factors"

   After due consideration, the CapRock board of directors concluded that the
potential benefits of the merger to CapRock and its stockholders outweighed the
risks associated with the merger.

   This discussion is not exhaustive of all the factors considered by the
CapRock board of directors. In view of the wide variety of factors considered
in connection with the board's evaluation of the merger and the complexity of
these matters, the CapRock board of directors did not quantify or otherwise
assign relative weights to the factors described above. Rather, the CapRock
board made its determination based on the totality of the information it
considered. The members of the board were aware that, as described below under
"--Interests of the CapRock Directors and Executive Officers in the Merger,"
directors and executive officers

                                       31
<PAGE>

of CapRock have interests in the merger in addition to, or different from,
their interests as stockholders in CapRock, and the board considered this in
deciding to recommend the transaction.

   CapRock cannot assure you that any of the expected results, synergies,
opportunities or other benefits described in this section will be achieved as a
result of the merger.

McLeodUSA's Reasons for the Merger

   Over the past several months, as the communications industry has continued
to experience consolidation and expansion, McLeodUSA has examined its own
opportunities to expand. In this regard, the McLeodUSA board of directors has
identified the acquisition of CapRock as an attractive opportunity that both
offers McLeodUSA an incremental step into markets where McLeodUSA has
considered expanding its operations and is consistent with the prior strategic
actions of McLeodUSA.

   McLeodUSA believes the merger will create a stronger company and will
provide significant value for its stockholders, employees and customers. The
main reasons for this view, among others, are the following:

  .  The acquisition of CapRock brings a strong set of new assets to
     McLeodUSA. McLeodUSA will increase by 19% its current target market from
     21 to 25 states. This addition brings a 34% increase in addressable
     points of presence (POPs). It will also take McLeodUSA to 18 new cities,
     an increase of 16% to a total of 133 cities.

  .  The McLeodUSA network will be expanded by adding approximately 5,000
     route miles of fiber optic cable, increasing the McLeodUSA total by 19%
     to approximately 31,000 route miles (including miles scheduled to be
     delivered by Level 3 during the first half of 2001). McLeodUSA believes
     the addition of this fiber is a logical, incremental step in the
     development of a network designed to provide a very broad range of
     products and services and to enable McLeodUSA to serve customers of all
     sizes. McLeodUSA expects to strengthen the interconnection of its
     network to the networks of existing carriers by adding CapRock
     colocations to those of McLeodUSA, bringing McLeodUSA's projected total
     to 600 by the end of 2000. Through the acquisition of CapRock, McLeodUSA
     will also gain an additional 12 voice switches and 17 ATM switches.

  .  McLeodUSA believes it will be able to leverage its proven management
     expertise in the areas of sales process, product development and
     customer service.

  .  McLeodUSA believes the addition of new sales people and strong
     operational management within CapRock will provide the firm base
     necessary to launch an incremental expansion by McLeodUSA into new
     areas.

  .  Because New Mexico and Arizona are target market states for both
     McLeodUSA and CapRock, McLeodUSA expects to recognize capital
     expenditure synergies in those states.

  .  McLeodUSA believes it will be able to negotiate better arrangements with
     CapRock's vendors.

  .  McLeodUSA expects savings from a "time to market" advantage. McLeodUSA
     believes that the merger will enable it to enter the CapRock markets
     more quickly than it would have been able to enter them otherwise.

   McLeodUSA cannot assure you that any of the potential savings, synergies or
opportunities considered by McLeodUSA will be achieved through completion of
the merger. See "Risk Factors" and "Cautionary Note Regarding Forward-Looking
Statements."

Opinion of the CapRock Financial Advisor

   Salomon Smith Barney has acted as the financial advisor to CapRock in
connection with the merger. At the meeting of the CapRock board of directors
held on October 2, 2000, Salomon Smith Barney delivered its

                                       32
<PAGE>

oral opinion, subsequently confirmed in writing, to the CapRock board that, as
of that date, the exchange ratio was fair, from a financial point of view, to
the holders of CapRock common stock (other than McLeodUSA and its affiliates).
No limitations were imposed by the CapRock board upon Salomon Smith Barney with
respect to the investigation made or the procedures followed by Salomon Smith
Barney in rendering its opinion. The opinion of Salomon Smith Barney was for
the use and benefit of the CapRock board in connection with its consideration
of the merger.

   The full text of the written opinion of Salomon Smith Barney, which sets
forth the assumptions made, procedures followed, matters considered and
limitations on the review undertaken by Salomon Smith Barney, is attached as
Appendix D to this proxy statement/prospectus. You are urged to read the
Salomon Smith Barney opinion in its entirety. The Salomon Smith Barney opinion
is directed only to the fairness, from a financial point of view, of the
exchange ratio to the holders of CapRock common stock and does not constitute a
recommendation as to how you should vote at the special meeting. The summary of
the opinion as discussed in this document is qualified in its entirety by
reference to the full text of the opinion, which is incorporated herein by
reference.

   In connection with the rendering of its opinion, Salomon Smith Barney
reviewed and analyzed, among other things, the following:

  .  drafts of the merger agreement

  .  publicly available business and financial information concerning CapRock

  .  financial forecasts and other information and data concerning the
     business and operations of CapRock furnished to it by CapRock for
     purposes of its analysis

  .  publicly available information concerning the trading of, and the
     trading market for, CapRock common stock

  .  publicly available business and financial information concerning
     McLeodUSA

  .  financial forecasts and other information and data concerning the
     business and operations of McLeodUSA, furnished to Salomon Smith Barney
     by McLeodUSA for purposes of its analysis

  .  publicly available information concerning the trading of, and the
     trading market for, McLeodUSA Class A common stock

  .  publicly available financial information with respect to certain other
     companies that Salomon Smith Barney believed to be relevant in
     evaluating CapRock or McLeodUSA and the trading markets for certain of
     such other companies' securities

  .  publicly available information concerning the nature and terms of
     certain other transactions that Salomon Smith Barney considered relevant
     to its inquiry

  .  pro forma financial impact of the merger on McLeodUSA

   Salomon Smith Barney conducted such other analyses and examinations and
considered such other information and financial, economic and market criteria
that it deemed appropriate. Salomon Smith Barney also met with officers,
directors and other representatives and advisors of CapRock and officers and
other representatives and advisors of McLeodUSA concerning the business,
operations and prospects of CapRock and McLeodUSA, respectively.

   In connection with its engagement, Salomon Smith Barney was requested to
approach, and Salomon Smith Barney held discussions with, third parties to
solicit indications of interest in the possible acquisition of all or a part of
CapRock or in providing financing to CapRock. These discussions resulted in
three indications of interest in a merger with, or investment in, CapRock.
Salomon Smith Barney noted that, with the exception of

                                       33
<PAGE>

the McLeodUSA proposal, the other preliminary proposals contained significant
contingencies, and there was no assurance as to the likelihood of executing
definitive agreements with respect to those preliminary proposals on a timely
basis.

   In rendering its opinion, Salomon Smith Barney assumed and relied upon the
accuracy and completeness of all financial and other information provided to
it, discussed with it or publicly available and did not attempt independently
to verify any of such information. Further, with respect to financial forecasts
and other information and data provided to or otherwise reviewed by or
discussed with Salomon Smith Barney, Salomon Smith Barney was advised by the
respective managements of CapRock and McLeodUSA that such forecasts and other
information and data were reasonably prepared on bases reflecting the best
currently available estimates and judgments of the respective managements of
CapRock and McLeodUSA as to the future financial performance of CapRock and
McLeodUSA, respectively, and the strategic implications and operational
benefits anticipated to result from the merger. Salomon Smith Barney has not
made or been provided with an independent evaluation or appraisal of the assets
or liabilities (contingent or otherwise) of CapRock or McLeodUSA or of the
solvency of either entity, nor did it make any physical inspection of the
properties or assets of CapRock or McLeodUSA. Salomon Smith Barney assumed that
the merger would be consummated in accordance with the terms of the merger
agreement and the other agreements entered into in connection therewith, and
would be treated as a tax free reorganization for federal income tax purposes.
Salomon Smith Barney further assumed that in the course of obtaining the
necessary regulatory or third party approvals for the merger, no limitations,
restrictions or conditions would be imposed that would have an adverse effect
on CapRock or McLeodUSA or the contemplated benefits to CapRock of the merger.

   In conducting its analysis and arriving at its opinion as expressed herein,
Salomon Smith Barney has considered financial terms of the merger in relation
to, among other things:

  .  current and historical market prices and trading volumes of CapRock
     common stock and McLeodUSA Class A common stock

  .  the historical and projected earnings and other operating data of
     CapRock and McLeodUSA

  .  the capitalization and financial condition of CapRock and McLeodUSA

  .  CapRock's current cash requirements for working capital, including for
     short-term obligations to suppliers, and its other near-term liquidity
     needs

   The opinion of Salomon Smith Barney relates to the relative values of
CapRock and McLeodUSA and does not express any opinion as to what the value of
McLeodUSA Class A common stock actually will be when issued pursuant to the
merger or the price at which McLeodUSA Class A common stock will trade
subsequent to the merger. The Salomon Smith Barney opinion does not address the
relative merits of the merger as compared to any alternative business
strategies that might exist for CapRock or the effect of any other transaction
in which CapRock might engage.

   In connection with its opinion, Salomon Smith Barney performed various
financial analyses, which it discussed with the CapRock board of directors on
October 2, 2000. The material portions of the analyses performed by Salomon
Smith Barney in connection with the rendering of its opinion are summarized
below.

   Liquidation Value. Salomon Smith Barney performed a liquidation valuation
analysis to derive a range of implied value per share as a result of
liquidation. In this analysis, Salomon Smith Barney relied on a gross property,
plant and equipment ("PP&E") multiple ranging from 0.76x to 0.84x and a net
PP&E multiple ranging from 0.90x to 1.00x, which were derived from the recent
sale in a bankruptcy proceeding of substantially all the assets of GST
Telecommunications, a facilities-based integrated communications provider in
the western United States.

   Based on this analysis, Salomon Smith Barney derived a total firm value
range of $425 million to $475 million and an implied value per share range of
$1.68 to $2.96 for CapRock, representing a discount ranging from 70.4% to 40.7%
from the implied value to CapRock stockholders based on the closing price of
CapRock

                                       34
<PAGE>

common stock as of October 2, 2000. For purposes of its analysis, Salomon Smith
Barney assumed that CapRock had total debt of $360 million and did not have a
cash balance.

   Discounted Cash Flow Analysis. Salomon Smith Barney performed a discounted
cash flow analysis to derive a range of equity values per share for CapRock. In
this analysis, Salomon Smith Barney assumed a weighted average cost of capital
for CapRock ranging from 15.5% to 17.5%. Terminal values for CapRock were based
on a range of 8.0x to 10.0x projected earnings before interest, taxes,
depreciation and amortization.

   In deriving a range of firm values for CapRock, Salomon Smith Barney
performed the discounted cash flow analysis using both management projections
provided by CapRock and projections adjusted to reflect Wall Street equity
research benchmarks for comparable companies. Salomon Smith Barney then applied
a discount to the range of equity values per share it derived for CapRock. This
discount was derived from the discount to discounted cash flow valuations
maintained by a select group of peer "smart build" CLEC companies as of October
2, 2000, which included Choice One, Mpower, Net2000, Network Plus, Pac-West
Telecom and US LEC. In this analysis, Salomon Smith Barney assumed a discount
ranging from 68.6% to 88.0%. Based upon this analysis, Salomon Smith Barney
derived the following ranges of firm values and adjusted equity values per
share for CapRock, in each case as of September 30, 2000:
<TABLE>
<CAPTION>
                                                                   Wall Street
                                                                    Benchmark
                                                       Management    Adjusted
                                                      Projections  Projections
                                                      ------------ ------------
   <S>                                                <C>          <C>
   Adjusted Equity Value (per share)................. $6.05-$19.17 $3.80-$12.45
</TABLE>

   Salomon Smith Barney noted that the achievement of these values was
dependent on numerous factors, particularly the achievement of projected
operating results and availability of capital required to finance CapRock's
business plan. Salomon Smith Barney observed that, under current market and
operating conditions, CapRock did not appear to have the required access to
capital and may not be able to operate as planned.

   Public Market Sum-of-the-Parts Valuation. Salomon Smith Barney performed a
sum-of-the-parts valuation analysis. For purposes of its analysis, Salomon
Smith Barney assumed that CapRock had total debt of $360 million, cash of $40
million and option/warrant proceeds of approximately $21 million. Based on this
analysis, Salomon Smith Barney derived a total sum-of-the-parts value range for
CapRock of $575 million to $975 million and an implied value per share range of
$6.49 to $15.90, representing a premium to the closing price of CapRock common
stock as of October 2, 2000 ranging from 28.4% to 216%.

   Salomon Smith Barney noted that these implied values represent a theoretical
"snapshot" of the values to prospective buyers or investors as of the date of
the analysis and that the values implied by this analysis were likely
superceded by the process by which prospective buyers and investors had already
been contacted (as discussed more fully in "--Recommendation of the CapRock
Board of Directors and Reasons for the Merger").

   Public Market Valuation of McLeodUSA. Using publicly available information,
Salomon Smith Barney also performed a public market valuation analysis for
McLeodUSA Class A common stock which, when multiplied by the exchange ratio,
resulted in a range of implied values per share to CapRock stockholders of
$5.81 to $6.73.

   Historical Stock Price Performance. Salomon Smith Barney reviewed the
historical stock performance of CapRock common stock as compared with the stock
performance of a selected group of peer group CLECs, including Adelphia
Business Solutions, e.spire, Electric Lightwave, ICG Communications, Intermedia
Communications, McLeodUSA, XO Communications, Time Warner Telecom and
Allegiance Telecom; and peer group fiber providers, including Broadwing, FLAG
Telecom, Global Crossing, Level 3 Communications, Metromedia Fiber Network,
TyCom, 360networks and Williams Communications. Salomon Smith Barney noted that
CapRock's stock price began underperforming the peer group companies in June
2000 and has severely underperformed since then as a result of a series of
events that have created financial uncertainty

                                       35
<PAGE>

regarding CapRock's prospects, including the announcements of the loss of a
major contract valued at more than $30 million, the anticipated failure to
achieve projected second quarter earnings and the resignation of its chief
financial officer.

   The preparation of a fairness opinion is a complex process and is not
susceptible to a partial analysis or summary description. The summary set forth
above is not and does not purport to be a complete description of the analyses
underlying Salomon Smith Barney's opinion or its presentation to the CapRock
board of directors. Salomon Smith Barney believes that its analyses and the
summary set forth above must be considered as a whole and that selecting
portions of its analyses and the factors considered by it, without considering
all such analyses and factors, could create an incomplete view of the processes
underlying the analyses discussed in its opinion. In addition, no company used
in the discounted cash flow analysis or the historical stock price performance
analysis summarized above is identical to CapRock or McLeodUSA or any of their
business segments. Salomon Smith Barney also may have deemed various
assumptions more or less probable than other assumptions, so that the ranges of
valuations resulting for any particular analysis described above should not be
taken to be Salomon Smith Barney's view of the actual value of CapRock.
Additionally, an analysis of the data described above necessarily involves
complex considerations and judgments concerning differences in financial and
operating characteristics of CapRock, McLeodUSA or any of their business
segments and other facts that could affect the public trading value or the
acquisition value of the companies to which they are being compared.

   In performing its analyses, Salomon Smith Barney made numerous assumptions
with respect to industry performance, general business, financial, market and
economic conditions and other matters, many of which are beyond the control of
CapRock or McLeodUSA. The analyses which Salomon Smith Barney performed are not
necessarily indicative of actual values or actual future results, which may be
significantly more or less favorable than suggested by such analyses. Such
analyses were prepared solely as part of Salomon Smith Barney's analysis of the
fairness, from a financial point of view, of the exchange ratio to holders of
CapRock common stock (other than McLeodUSA and its affiliates). The analyses do
not purport to be appraisals or to reflect the prices at which a company or any
of its businesses might actually be sold or the prices at which any securities
may trade at the present time or at any time in the future. In addition, the
opinion of Salomon Smith Barney and Salomon Smith Barney's presentation to the
CapRock board of directors were among the many factors taken into consideration
by the CapRock board in making its determination to approve the merger.

   Salomon Smith Barney is an internationally recognized investment banking
firm that provides financial services in connection with a wide range of
business transactions. As part of its business, Salomon Smith Barney regularly
engages in the valuation of companies and their securities in connection with
mergers and acquisitions, negotiated underwritings, competitive biddings,
secondary distributions of listed and unlisted securities, private placements
and other purposes. In the ordinary course of its business, Salomon Smith
Barney or its affiliates may actively trade or hold the securities of CapRock
and McLeodUSA for its own account or the account of its customers and,
accordingly, may at any time hold a long or short position in such securities.
In addition, Salomon Smith Barney has rendered certain investment banking
services to CapRock and McLeodUSA, respectively, unrelated to the proposed
merger, for which Salomon Smith Barney received compensation. Salomon Smith
Barney and its affiliates (including Citigroup Inc. and its affiliates) may
maintain other business relationships with CapRock, McLeodUSA and their
respective affiliates. The CapRock board of directors retained Salomon Smith
Barney based on Salomon Smith Barney's expertise in the valuation of companies
as well as its substantial experience in transactions such as the merger.

   Miscellaneous. Pursuant to the terms of an engagement letter dated September
11, 2000, CapRock agreed to pay Salomon Smith Barney for its financial advisory
and investment banking services a fee of $1.1 million, and, if the merger is
completed, a transaction fee payable upon completion of the merger in a maximum
aggregate amount, together with amounts previously paid or payable for
financial advisory and investment banking services, equal to the greater of $4
million or 0.7% of the transaction value.

   CapRock also agreed to reimburse Salomon Smith Barney for all reasonable
expenses incurred in performing its services, including legal fees and
expenses, and to indemnify Salomon Smith Barney and certain

                                       36
<PAGE>

related parties against certain liabilities in connection with Salomon Smith
Barney's engagement, including liabilities under the securities laws.

Independent Auditors

   The partial presentation of prospective financial information included or
referred to in this document on pages 32 through 37 has been prepared by, and
is the responsibility of, the management of CapRock and its financial advisor.
Arthur Andersen LLP and KPMG LLP have neither examined nor compiled that
prospective financial information, and accordingly, Arthur Andersen LLP and
KPMG LLP do not express an opinion or any other form of assurance with respect
thereto and accept no responsibility for that information. The Arthur Andersen
LLP and KPMG LLP reports on the consolidated financial statements of McLeodUSA
and CapRock, respectively, incorporated by reference in this proxy
statement/prospectus, relate to the historical financial information of
McLeodUSA and CapRock, respectively. They do not extend to the prospective
financial information and should not be read to do so.

Interests of the CapRock Directors and Executive Officers in the Merger

   Some directors and executive officers of CapRock have interests in the
merger that are in addition to, or different from, their interests as
stockholders of CapRock. The CapRock board of directors knew about these
interests, and considered them, when it approved the merger agreement. These
interests are summarized below.

   Options. Under the terms of the CapRock 1998 Director Stock Option Plan and
the CapRock 1998 Equity Incentive Plan, upon the completion of the merger, a
total of 1,494,054 outstanding, non-vested options to purchase CapRock common
stock held by CapRock directors and executive officers, as listed in the table
below, will vest and become immediately exercisable. McLeodUSA will either
assume each unexercised CapRock stock option outstanding at the effective time
of the merger or issue substitute stock options to purchase McLeodUSA Class A
common stock in replacement of all unexercised CapRock stock options
outstanding at the effective time of the merger as described under "Terms of
the Merger Agreement and Related Transactions--Conversion of CapRock Common
Stock; Treatment of Options."

   The following table shows the number of unvested options held by the CapRock
directors and executive officers whose vesting will accelerate as a result of
the merger, assuming the merger is completed as of December 31, 2000.

<TABLE>
<CAPTION>
                                                          Number of Unvested
                                                            CapRock Options
   Name of Director                                      that Accelerate as a
   or Executive Officer                                 Result of the Merger(1)
   --------------------                                 -----------------------
   <S>                                                  <C>
   Jere W. Thompson, Jr. ..............................          97,500
   Leo J. Cyr..........................................         583,334
   James E. Skinner....................................         250,000
   Timothy W. Rogers...................................          56,250
   Mark Langdale.......................................           4,668
   Christopher J. Amenson..............................           4,668
   John R. Harris......................................           2,334
   T. George Hess......................................         200,250
   Claude A. Robertson.................................         130,000
   Kenneth L. Monblatt.................................         165,050
</TABLE>
  --------
  (1) This represents the number of CapRock options estimated to be
      unvested as of December 31, 2000. The aggregate estimated value of
      unvested options shown in this table is approximately $406,000
      based upon the October 25, 2000 closing price for McLeodUSA Class A
      common stock of $15.50 multiplied by the exchange ratio of 0.3876,
      less the exercise price of these options.


                                       37
<PAGE>

   Current Employment Agreements. CapRock has employment agreements with Jere
W. Thompson, Jr., Leo J. Cyr, James E. Skinner and Timothy W. Rogers, each of
whom is an executive officer of CapRock. Under these agreements, if the
executive's employment with CapRock is terminated by CapRock without cause, as
defined in the agreements, the executive's stock options vest and the executive
is entitled to receive severance compensation and benefits consisting of the
following:

  .  Jere W. Thompson, Jr.--If Mr. Thompson's employment is terminated
     without cause, he will receive payments equal to the base salary that
     would have been payable over the period commencing on the date of
     termination and ending on April 30, 2001, which will in no event be less
     than six months. Mr. Thompson's current base salary is $265,000 per
     year.

  .  Leo J. Cyr--If Mr. Cyr's employment is terminated without cause, he will
     receive payments equal to the base salary that would have been payable
     over the period commencing on the date of termination and ending 12
     months thereafter. CapRock will also continue to provide group health
     coverage for Mr. Cyr and his dependents during such 12-month period. Mr.
     Cyr's current base salary is $250,000 per year. Mr. Cyr may be entitled
     to a loan or a cash payment from CapRock with respect to any excise tax
     he is subject to as a result of the merger.

  .  James E. Skinner--If Mr. Skinner's employment is terminated without
     cause, he will receive payments equal to the base salary that would have
     been payable over the period commencing on the date of termination and
     ending 12 months thereafter. CapRock will also continue to provide group
     health coverage for Mr. Skinner and his dependents during such 12-month
     period. Mr. Skinner's current base salary is $235,000 per year.

  .  Timothy W. Rogers--If Mr. Rogers' employment is terminated without
     cause, he will receive payments equal to the base salary that would have
     been payable over the period commencing on the date of termination and
     ending on April 30, 2001, which will in no event be less than six
     months. Mr. Rogers' current base salary is $210,000 per year.

   CapRock has also agreed to provide Kenneth L. Monblatt, who is also an
executive officer of CapRock, severance pay in an amount equal to 12 months'
base salary if there is a change of control and his position is eliminated, the
scope of his position and responsibilities are decreased or he is required to
move more than 50 miles. Mr. Monblatt's current base salary is $220,000.

   Restricted Stock Agreements. CapRock has entered into restricted stock
agreements with Messrs. Cyr, Skinner and Monblatt pursuant to which such
executive officers received 100,000, 50,000 and 15,000 shares of restricted
stock, respectively. Under these agreements, all shares of restricted stock
will become fully vested immediately prior to the completion of the merger. In
addition, if the employment of Mr. Cyr or Mr. Skinner is terminated without
cause, then the vesting schedule is accelerated so that such person's
restricted stock becomes fully vested immediately prior to the termination of
his employment.

   Loan Agreement. In connection with Mr. Cyr's employment agreement, CapRock
loaned to Mr. Cyr the principal amount of $900,000, payable over three years.
Under Mr. Cyr's employment agreement, upon the completion of the merger, the
outstanding principal amount of the loan and any accrued but unpaid interest
thereon is forgiven. On October 18, 2000, the one year anniversary of Mr. Cyr's
employment agreement, the first required payment of principal in the amount of
$300,000 and all of the accrued but unpaid interest through that date was
forgiven.

   Grant of Option. In connection with the merger agreement, McLeodUSA and Jere
W. Thompson, Sr., The Williamsburg Corporation, Margaret D. Thompson, Jere W.
Thompson, Jr., Greenway Holdings, Ltd., CapRock Systems, Inc., Mark Langdale,
The Mark Langdale 1999 Trust, The Patricia Langdale 1999 Trust, CapRock
Investors and Timothy W. Rogers entered into a voting and option agreement
under which these CapRock stockholders, representing approximately 39% of
CapRock's issued and outstanding shares of common stock, granted to McLeodUSA
an option to purchase their CapRock shares. The option is exercisable for cash
or stock, at McLeodUSA's option, under specified circumstances, including those
under which

                                       38
<PAGE>

CapRock is required to pay McLeodUSA the $7.85 million termination fee under
the merger agreement. In addition, if McLeodUSA exercises the option and within
12 months of such exercise CapRock completes any other takeover proposal,
McLeodUSA will pay an amount of additional consideration equal to 50% of the
difference between the aggregate price paid by McLeodUSA upon exercise of the
option and the aggregate amount received by McLeodUSA in the takeover proposal.
For a description of the terms of the voting and option agreement, see "Terms
of the Merger Agreement and Related Transactions--Grant of Option."

   Voting Agreements. Directors, executive officers and other stockholders of
CapRock have entered into voting agreements with respect to the voting of their
shares of CapRock common stock in connection with the merger. By entering into
these voting agreements, the holders of approximately 52% of the outstanding
shares of CapRock common stock have agreed to vote in favor of the approval of
the merger agreement. For a description of the terms of such voting agreements,
see "Terms of the Merger Agreement and Related Transactions--Voting
Agreements."

   Directors' and Officers' Insurance and Indemnification. The merger agreement
provides that for six years after the effective time of the merger, McLeodUSA
will, and will cause CapRock to, maintain directors' and officers' liability
insurance to cover current and former directors and officers of CapRock with
respect to claims against them arising from facts or events which occurred
before the merger. Subject to specified limitations, this insurance will have
at least the same maximum coverage and amounts as, and terms and conditions no
less advantageous than, the coverage currently provided by CapRock.

   The merger agreement requires the surviving corporation in the merger to
continue to indemnify each current and former director, officer and agent of
CapRock and its subsidiaries following the merger against all expenses or
liabilities incurred in connection with any claim or investigation arising out
of actions or omissions occurring before the merger as provided in their
respective articles of incorporation and bylaws. The surviving corporation will
also assume any indemnification or other similar agreement of CapRock in effect
on the date of the merger agreement. CapRock has entered into indemnification
agreements with each of its directors, Mr. Skinner and Kevin W. McAleer, a
former executive officer of CapRock. Such agreements require CapRock to
indemnify such persons and advance expenses to the fullest extent permitted by
law. See "Terms of the Merger Agreement and Related Transactions--Directors'
and Officers' Insurance and Indemnification."

Accounting Treatment

   The merger is expected to be accounted for using the purchase method of
accounting. McLeodUSA will be deemed the acquiror for financial reporting
purposes. Under the purchase method of accounting, the purchase price in the
merger is allocated among the CapRock assets acquired and the CapRock
liabilities assumed to the extent of their fair market value with any excess
purchase price being allocated to goodwill.

Listing of McLeodUSA Class A Common Stock

   McLeodUSA has agreed to use its commercially reasonable efforts to cause the
shares of McLeodUSA Class A common stock issuable in the merger to be approved
for quotation on the Nasdaq National Market, subject to official notice of
issuance.

Delisting and Deregistration of CapRock Common Stock

   If the merger is completed, CapRock common stock will no longer be quoted on
the Nasdaq National Market and will be deregistered under the Securities
Exchange Act.

Governmental and Regulatory Approvals

   Under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 and the rules
promulgated thereunder by the Federal Trade Commission, the merger may not be
completed until notifications have been given and

                                       39
<PAGE>

certain information has been furnished to the Antitrust Division of the
Department of Justice and the FTC and specified waiting period requirements
have been satisfied. McLeodUSA and CapRock each filed, on October 12, 2000 and
October 13, 2000, respectively, premerger notification and report forms with
the Antitrust Division and the FTC, and were granted early termination of the
waiting period by the FTC on October 24, 2000.

   At any time before or after the effective time of the merger, the Antitrust
Division, the FTC or a private person or entity could seek under antitrust
laws, among other things, to enjoin the merger or to cause McLeodUSA to divest
itself, in whole or in part, of the surviving corporation of the merger or of
certain businesses conducted by the surviving corporation. There can be no
assurance that a challenge to the merger will not be made or that, if such a
challenge is made, McLeodUSA will prevail. The obligation of McLeodUSA and
CapRock to complete the merger is subject to the condition that the applicable
waiting period under the HSR Act shall have been terminated or shall have
expired without action by the Antitrust Division or the FTC to prevent
completion of the merger.

   Under the laws of Louisiana, Oklahoma and Texas, where CapRock is certified
as a competitive local exchange carrier (CLEC), McLeodUSA and CapRock are
required to make certain filings and/or obtain regulatory approval of the
merger from the Louisiana Public Service Commission, the Oklahoma Corporation
Commission and the Texas Public Utility Commission. McLeodUSA and CapRock have
filed the necessary documents with these commissions. CapRock is also certified
as a CLEC in Arizona, Kansas and Missouri. McLeodUSA, however, is already
certified as a CLEC in these states and therefore intends to relinquish
CapRock's CLEC certificate following the merger and operate pursuant to
McLeodUSA's own certificate. The remaining states where CapRock is certified as
a CLEC, Arkansas and Tennessee, do not require prior regulatory approval or
other action in order for McLeodUSA and CapRock to complete the merger.
McLeodUSA and CapRock intend to contact the limited number of CapRock customers
in each of these states to inform them that CapRock will cease providing
service and request each customer's authorization to transfer their account to
McLeodUSA or another service provider.

   CapRock is also certified to provide intrastate interexchange (IXC) services
in numerous states, although CapRock has only a minimal number of long distance
customers. McLeodUSA, however, is already certified to provide IXC services in
every state in which CapRock is authorized to provide such service. McLeodUSA
and CapRock have filed for regulatory approval of the merger in California and
Florida. CapRock will soon file for approval to relinquish its IXC certificates
in those certain jurisdictions in which (a) McLeodUSA already holds the
authority required to provide the IXC services and (b) regulatory approval of
the merger would be required if CapRock's certificates were not relinquished.
McLeodUSA and CapRock intend to contact the limited number of CapRock customers
in these states to inform them that CapRock will cease providing service and
request authorization to transfer the customers' accounts to McLeodUSA or
another service provider.

   In addition, McLeodUSA and CapRock must obtain the approval of the Federal
Communications Commission for transfer of certain licenses and certificates
granted by the FCC to CapRock. All necessary FCC filings have already been
made.

   See "Terms of the Merger Agreement and Related Transactions--Conditions to
Completion of the Merger" and "--Termination of the Merger Agreement."

Federal Income Tax Consequences

   The following discussion is a summary of the material United States federal
income tax consequences of the merger to a CapRock stockholder holding shares
of CapRock common stock as a capital asset at the effective time of the merger.

   This discussion does not address all aspects of federal taxation that may be
relevant to particular CapRock stockholders in light of their personal
circumstances or to CapRock stockholders subject to special treatment under the
Internal Revenue Code, including, without limitation, banks, tax-exempt
organizations, insurance

                                       40
<PAGE>

companies, dealers in securities or foreign currencies, CapRock stockholders
who received their CapRock stock through the exercise of employee stock options
or otherwise as compensation, CapRock stockholders who are not U.S. persons and
CapRock stockholders who hold CapRock stock as part of a hedge, straddle or
conversion transaction. We have not described tax consequences that arise from
rules that apply generally to all taxpayers from the ownership of McLeodUSA
Class A common stock. We have also not described tax consequences that we
assume to be generally known by investors. In addition, the discussion does not
address any state, local or foreign tax consequences of the merger. Finally,
the tax consequences to holders of CapRock stock options or CapRock restricted
stock are not discussed.

   The discussion is based on the Internal Revenue Code, the United States
Department of Treasury regulations and administrative rulings and court
decisions as of the date of this proxy statement/prospectus, all of which are
subject to change, possibly with retroactive effects, and which are subject to
differing interpretations. No ruling has been or will be sought from the
Internal Revenue Service concerning the tax consequences of the merger. CapRock
stockholders are urged to consult their tax advisors regarding the tax
consequences of the merger to them, including the effects of United States
federal, state, local, foreign and other tax laws.

   The obligation of CapRock to complete the merger is subject to the
condition, which may be waived, that CapRock receive a legal opinion from
Munsch Hardt Kopf & Harr, P.C. to the effect that the merger will qualify as a
reorganization within the meaning of Section 368(a) of the Internal Revenue
Code. The opinion will be based on customary assumptions and factual
representations and will assume that the merger will be completed according to
the terms of the merger agreement.

   The following discussion of United States federal income tax consequences of
the merger assumes that, if completed, the merger will qualify as a
reorganization within the meaning of Section 368(a) of the Internal Revenue
Code, subject to the assumptions, limitations, qualifications and other
considerations described below under "--Considerations with Respect to the
Opinion."

   Accordingly, if the merger is completed:

  .  CapRock and McLeodUSA will not recognize gain or loss as a result of the
     merger

  .  no gain or loss will be recognized by a CapRock stockholder as a result
     of the exchange of all of such CapRock stockholder's shares of CapRock
     common stock solely for shares of McLeodUSA Class A common stock, except
     that gain or loss may be recognized with respect to cash received in
     lieu of a fractional share of McLeodUSA Class A common stock

  .  a CapRock stockholder who receives cash in lieu of a fractional share of
     McLeodUSA Class A common stock will recognize gain or loss with respect
     to the cash received, measured by the difference between (a) the amount
     of cash received and (b) the CapRock stockholder's tax basis in the
     fractional share. This gain or loss will be capital gain or loss and
     will be long-term capital gain or loss if the shares of CapRock common
     stock have been held for more than one year at the time the merger is
     completed

  .  a CapRock stockholder's aggregate tax basis in the shares of McLeodUSA
     Class A common stock received by such CapRock stockholder in the merger
     will initially be equal to (a) the CapRock stockholder's aggregate tax
     basis in the shares of CapRock common stock owned by such CapRock
     stockholder immediately prior to the merger, reduced by (b) the amount
     of basis allocable to any fractional share, as described above

  .  a CapRock stockholder's holding period for the shares of McLeodUSA Class
     A common stock received by such CapRock stockholder in the merger,
     including any fractional share for which the stockholder received cash,
     will include the holding period of the shares of CapRock common stock
     owned by such CapRock stockholder immediately prior to the merger

  .  CapRock stockholders must retain records and file a statement setting
     forth facts about the merger with their United States federal income tax
     returns

                                       41
<PAGE>

   Backup Withholding. Certain non-corporate CapRock stockholders may be
subject to backup withholding at a 31% rate on cash payments received instead
of fractional shares of McLeodUSA Class A common stock. Backup withholding will
not apply, however, to a CapRock stockholder who:

  .  furnishes a correct taxpayer identification number and certifies that
     he, she or it is not subject to backup withholding on the substitute
     Form W-9 or successor form included in the letter of transmittal to be
     delivered to CapRock stockholders following the date of completion of
     the merger

  .  provides a certification of foreign status on form W-8 or successor form

  .  is otherwise exempt from backup withholding

   Considerations with Respect to the Opinion. The tax opinion of Munsch Hardt
Kopf & Harr, P.C. and the foregoing summary of the material United States
federal income tax consequences of the merger are and will be subject to
assumptions, limitations and qualifications and are based on current law and,
among other things, representations of CapRock and McLeodUSA, including
representations made by the respective managements of CapRock and McLeodUSA.
The opinion of counsel is not binding on the Internal Revenue Service and does
not preclude the Internal Revenue Service from adopting a contrary position. In
addition, if any of the representations or assumptions are inconsistent with
the actual facts, the United States federal income tax consequences of the
merger could be adversely affected.

   The foregoing discussion is not intended to be a complete analysis or
description of all potential United States federal income tax consequences or
any other consequences of the merger. The tax consequences of the merger to you
may be different from those summarized above, based on your individual
situation. Accordingly, CapRock stockholders are strongly urged to consult with
their tax advisors with respect to the particular United States federal, state,
local or foreign income tax or other tax consequences of the merger to them.

Restrictions on Resales by Affiliates

   The McLeodUSA Class A common stock to be issued to CapRock stockholders in
the merger will be freely transferable under the Securities Act, except for
shares issued to any person who may be deemed to be an "affiliate" of CapRock
within the meaning of Rule 145 under the Securities Act or who will become an
"affiliate" of McLeodUSA within the meaning of Rule 144 under the Securities
Act after the merger. Shares of McLeodUSA Class A common stock received by
persons who are deemed to be CapRock affiliates or who become McLeodUSA
affiliates may be resold by these persons only in transactions permitted by the
limited resale provisions of Rule 145 or as otherwise permitted under the
Securities Act. Persons who may be deemed to be affiliates of CapRock generally
include individuals or entities that, directly or indirectly through one or
more intermediaries, control, are controlled by or are under common control
with CapRock and may include officers, directors and principal CapRock
stockholders. All CapRock stockholders who may be deemed to be CapRock
affiliates will be so advised prior to the effective time of the merger.

   CapRock has agreed to use its commercially reasonable efforts to obtain an
affiliate agreement from each affiliate of CapRock prior to the completion of
the merger by which each CapRock affiliate will agree not to sell any of the
McLeodUSA Class A common stock received in the merger in violation of the
Securities Act. This proxy statement/prospectus does not cover resales of
shares of McLeodUSA Class A common stock received by any person upon completion
of the merger, and no person is authorized to make any use of this proxy
statement/prospectus in connection with any such resale.

No Appraisal Rights

   CapRock is a Texas corporation. Under Texas law, CapRock stockholders are
not entitled to appraisal rights in connection with the merger because, on the
record date, shares of CapRock common stock were designated and quoted on the
Nasdaq National Market and will be converted into shares of McLeodUSA Class

                                       42
<PAGE>

A common stock, which immediately after the effective time of the merger will
be designated and quoted on the Nasdaq National Market.

CapRock Debt Securities

   CapRock has two series of publicly traded debt securities outstanding, its
12% senior notes due 2008 and its 11 1/2% senior notes due 2009. CapRock has
received consents from holders of a majority of the outstanding principal
amount of each series of notes to amend the respective indentures governing the
notes to provide that the merger will neither violate the indentures nor
constitute a change of control thereunder, and expects shortly to enter into
supplemental indentures with the trustee under the indentures to effect these
amendments.

   Additionally, as required by the merger agreement, CapRock has received the
requisite consents to amend the indentures governing each series of notes to
eliminate most of the restrictive covenants and reporting requirements
contained in the indentures. The consent of holders of a majority of the
outstanding principal amount of each series of notes was required to effect
these amendments, which will become effective upon the later of the effective
time of the merger and 20 business days after commencement of the exchange
offers described below. Obtaining the foregoing requisite consents is a
condition to the completion of the merger.

   The merger agreement requires that McLeodUSA prepare and file a registration
statement on Form S-4 to effect exchange offers to acquire all of the
outstanding CapRock 12% notes and CapRock 11 1/2% notes in exchange for a like
principal amount of notes of McLeodUSA having the same interest rate, payment,
maturity and redemption terms as the applicable CapRock notes. Such
registration statement on Form S-4 was filed with the SEC on October 19, 2000
and was declared effective by the SEC on October 30, 2000.

                                       43
<PAGE>

             TERMS OF THE MERGER AGREEMENT AND RELATED TRANSACTIONS

   The following summary of the material terms and provisions of the merger
agreement, the voting and option agreement and the voting agreement is
qualified in its entirety by reference to such agreements. The merger
agreement, the voting and option agreement and the voting agreement are
attached as Appendices A, B and C, respectively, to this proxy
statement/prospectus and are considered part of this document.

Structure of the Merger

   Subject to the terms and conditions of the merger agreement and in
accordance with Delaware and Texas law, at the effective time of the merger,
Cactus Acquisition Corp., a wholly-owned subsidiary of McLeodUSA, will merge
with and into CapRock. CapRock will continue its corporate existence under the
laws of the State of Texas under the name "CapRock Communications Corp." as a
wholly-owned subsidiary of McLeodUSA. At the effective time of the merger, the
separate corporate existence of Cactus Acquisition Corp. will terminate. The
articles of incorporation and bylaws of CapRock will become the articles of
incorporation and bylaws of the surviving corporation of the merger, except
that Article 4 of such articles of incorporation will be amended to reduce the
number of shares of authorized capital stock of the surviving corporation.

Conversion of CapRock Common Stock; Treatment of Options

   At the effective time of the merger, each issued and outstanding share of
CapRock common stock, other than shares directly owned by CapRock, McLeodUSA or
Cactus Acquisition Corp., will be converted into the right to receive 0.3876 of
a share of McLeodUSA Class A common stock, which is the exchange ratio, as well
as cash, without interest, for fractional shares.

   Each share of CapRock common stock directly owned by CapRock, McLeodUSA or
Cactus Acquisition Corp. will automatically be canceled and will cease to exist
at the effective time of the merger without the payment of any consideration.
Each share of common stock of Cactus Acquisition Corp. issued and outstanding
immediately prior to the effective time of the merger will be converted into a
validly issued, fully paid and non-assessable share of common stock of the
surviving corporation of the merger.

   If, prior to the effective time of the merger, McLeodUSA changes, or
establishes a record date for changing, the number of shares of McLeodUSA Class
A common stock issued and outstanding as a result of any stock split, stock
dividend, recapitalization, subdivision, reclassification, combination,
exchange of shares or any similar transaction and the record date of such
change is prior to the effective date of the merger, the exchange ratio will be
proportionately adjusted to reflect the change.

   In addition, no fractional shares of McLeodUSA Class A common stock will be
issued in the merger. For each fractional share that would otherwise be issued,
a CapRock stockholder will receive cash in an amount equal to the fractional
share multiplied by the closing price of a share of McLeodUSA Class A common
stock on the closing date of the merger, as such price is quoted on the Nasdaq
National Market, less any required withholding tax. No interest will be paid or
accrue on any cash in lieu of fractional shares payable to the CapRock
stockholders.

   Upon completion of the merger, each outstanding option to acquire shares of
CapRock common stock which was granted prior to the date of the merger
agreement will become fully vested and exercisable.

   Prior to the effective time of the merger, McLeodUSA and CapRock will take
such actions as may be necessary or advisable to enable McLeodUSA, at its
option, either to:

  .  assume each option to acquire shares of CapRock common stock outstanding
     immediately prior to the merger or

  .  issue a substitute option to acquire shares of McLeodUSA Class A common
     stock in respect of each outstanding CapRock stock option

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<PAGE>

   As to each substitute option, as soon as reasonably practicable after the
merger, McLeodUSA will issue to each holder of a CapRock stock option a
document evidencing the foregoing substitution by McLeodUSA.

   At the effective time of the merger, each CapRock stock option outstanding
immediately prior to the effective time of the merger that McLeodUSA elects to
assume will be amended and converted into, and each substitute stock option
issued by McLeodUSA in respect of a CapRock stock option outstanding
immediately prior to the effective time of the merger will be, an option to
acquire, on the same terms and conditions as were applicable under such CapRock
stock option (provided that the date of grant of a substitute option will be
deemed to be the date on which the corresponding CapRock stock option was
granted), the number of shares of McLeodUSA Class A common stock (rounded down
to the nearest whole share) determined by multiplying:

  .  the number of shares of CapRock common stock subject to such CapRock
     stock option by

   .  the exchange ratio,

   at a price per share of McLeodUSA Class A common stock (rounded up to the
nearest whole cent) equal to:

  .  the aggregate exercise price for the shares of CapRock common stock
     otherwise purchasable pursuant to the CapRock stock option divided by

  .  the aggregate number of shares of McLeodUSA Class A common stock deemed
     purchasable in accordance with the foregoing

   As soon as practicable after the effective time of the merger, McLeodUSA
will cause a number of shares of McLeodUSA Class A common stock equal to the
number of shares issuable with respect to the CapRock stock options as adjusted
in accordance with the merger agreement to be registered under the Securities
Act on a registration statement on Form S-8. This registration statement will
be kept effective, and the current status of any prospectus will be maintained,
for so long as such options remain outstanding.

Exchange of Certificates

   For the benefit of the holders of CapRock common stock outstanding
immediately prior to the effective time, McLeodUSA has agreed to deposit with
Wells Fargo Bank Minnesota, N.A., or another bank or trust company acceptable
to McLeodUSA and CapRock, as exchange agent in the merger, certificates
representing the shares of McLeodUSA Class A common stock issuable to CapRock
stockholders under the merger agreement. After the effective time of the
merger, McLeodUSA will make available to the exchange agent cash necessary to
pay dividends and other distributions, if any, and to make payments for
fractional shares of McLeodUSA Class A common stock all as provided for in the
merger agreement.

   As soon as reasonably practicable after the effective time of the merger,
the exchange agent will mail a letter of transmittal to each holder of CapRock
common stock. The letter of transmittal will contain instructions with respect
to the surrender to the exchange agent of CapRock common stock certificates.

   CapRock stockholders should not return their stock certificates with the
enclosed proxy, nor should they forward them to the exchange agent unless and
until they receive the letter of transmittal, at which time they should forward
them only in accordance with the instructions accompanying the letter of
transmittal.

   Until holders of certificates previously representing CapRock common stock
have surrendered those certificates to the exchange agent for exchange, the
holder will not receive dividends or distributions on the McLeodUSA Class A
common stock into which such shares have been converted with a record date
after the effective time of the merger, and will not receive cash for any
fractional shares of McLeodUSA Class A common stock. When holders surrender
such certificates, they will receive any unpaid dividends and any cash for
fractional shares of McLeodUSA Class A common stock without interest.

   Any shares of McLeodUSA Class A common stock and cash that remain
undistributed by the exchange agent one year after the effective time of the
merger will be delivered to McLeodUSA upon demand. After this

                                       45
<PAGE>

period, certificates representing CapRock common stock must be surrendered for
exchange to McLeodUSA. Any shares of McLeodUSA Class A common stock and cash
that remain undistributed two years after the effective time of the merger will
become, to the extent permitted by applicable law, the property of McLeodUSA.
None of McLeodUSA, Cactus Acquisition Corp., CapRock or the exchange agent will
be liable for any shares of McLeodUSA Class A common stock, dividends or
distributions on this stock or cash for fractional shares delivered to a public
official under any abandoned property, escheat or similar laws.

   If a certificate representing CapRock common stock has been lost, stolen or
destroyed, the exchange agent will issue the consideration properly payable in
accordance with the merger agreement upon the making of an affidavit of such
loss, theft or destruction by the claimant, and, if required by McLeodUSA or
the exchange agent, the posting of a bond as indemnity against any claim that
may be made against McLeodUSA, CapRock or the exchange agent with respect to
such certificate.

   In the event of a transfer of ownership of CapRock common stock which is not
registered in the transfer records of CapRock, a certificate representing the
proper number of shares of McLeodUSA Class A common stock may be issued to a
person other than the person in whose name the certificate so surrendered is
registered if:

  .  such certificate is properly endorsed or otherwise is in proper form for
     transfer

  .  the person requesting such issuance will (1) pay any transfer or other
     taxes resulting from the issuance of shares of McLeodUSA Class A common
     stock to a person other than the registered holder of such certificate
     or (2) establish to McLeodUSA that such tax has been paid or is not
     applicable

   All shares of McLeodUSA Class A common stock issued upon conversion of
shares of CapRock common stock, including any cash paid instead of any
fractional shares of McLeodUSA Class A common stock, will be issued in full
satisfaction of all rights relating to such shares of CapRock common stock.

   For a description of the McLeodUSA Class A common stock and a description of
the differences between the rights of the holders of CapRock common stock, on
the one hand, and holders of McLeodUSA Class A common stock, on the other, see
"McLeodUSA Capital Stock and Comparison of Stockholder Rights."

Continuation of Employee Benefits

   During the six-month period following the effective time, McLeodUSA will
cause the surviving corporation in the merger

  .  to maintain the CapRock benefit plans, other than equity-based
     arrangements, in effect on the date of the merger agreement or

  .  to replace all or any of the CapRock benefit plans with employee benefit
     plans and programs maintained for similarly situated employees of
     McLeodUSA, provided that the aggregate level of benefits, other than
     equity-based arrangements, will be substantially comparable to the
     aggregate level of benefits provided by the CapRock benefit plans in
     effect on the date of the merger agreement

   To the extent that any plan of McLeodUSA or any of its affiliates becomes
applicable to any employee or former employee of CapRock or its subsidiaries,
McLeodUSA will grant, or cause to be granted, to such employees or former
employees credit for their service with CapRock and its subsidiaries and any of
their predecessors for the purpose of determining eligibility to participate
and nonforfeitability of benefits under such plans of McLeodUSA and for
purposes of benefit accrual under vacation and severance pay plans, but only to
the extent such service was credited under similar plans of CapRock and its
subsidiaries.

   McLeodUSA will cause CapRock or the surviving corporation in the merger to
honor in accordance with their respective terms, as in effect on the date of
the merger agreement, CapRock benefit agreements as disclosed in the merger
agreement.

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<PAGE>

Effective Time

   The merger will become effective upon the filings of the certificate of
merger and the articles of merger with the Secretary of State of Delaware and
the Secretary of State of Texas, respectively, or such later time as is agreed
upon by McLeodUSA and CapRock and specified in the certificate of merger and
the articles of merger. The filings of the certificate of merger and the
articles of merger will occur as soon as practicable, but no later than the
second business day, after satisfaction or waiver of the conditions to the
completion of the merger described in the merger agreement unless another date
is agreed to in writing by McLeodUSA and CapRock. CapRock and McLeodUSA
anticipate that, if the merger agreement is approved at the special meeting,
the merger will be completed promptly after such approval.

Representations and Warranties

   The merger agreement contains customary representations and warranties of
McLeodUSA and CapRock relating to, among other things:

  .  corporate organization and similar corporate matters

  .  subsidiaries

  .  capital structure

  .  authorization, execution, delivery, performance and enforceability of,
     and required consents, approvals, orders and authorizations of
     governmental authorities relating to, the merger agreement and related
     matters

  .  documents filed with the SEC, the accuracy of information contained in
     such documents and the absence of undisclosed liabilities

  .  the accuracy of information supplied in connection with this proxy
     statement/prospectus and the registration statement of which it is a
     part

  .  absence of events that would constitute a material adverse change since
     December 31, 1999

  .  outstanding and pending litigation

  .  no defaults under certain contracts

  .  satisfaction or inapplicability of certain state takeover statutes'
     requirements

  .  engagement and payment of fees of brokers, investment bankers, finders
     and financial advisors

  .  required stockholder vote of CapRock and no required stockholder vote of
     McLeodUSA

  .  absence of any action by or knowledge of any fact reasonably likely to
     prevent the merger from qualifying as a reorganization under Section
     368(a) of the Internal Revenue Code

   The merger agreement also contains customary representations of CapRock
relating to, among other things:

  .  compliance with applicable laws

  .  absence of changes in benefit plans

  .  matters relating to the Employee Retirement Income Security Act

  .  filing of tax returns and payment of taxes

  .  receipt of fairness opinion from its financial advisor

  .  intellectual property

   The foregoing representations and warranties will not survive the effective
time of the merger.

                                       47
<PAGE>

Business of CapRock and Its Subsidiaries Pending the Merger

   Under the merger agreement, CapRock has agreed that, unless consented to in
writing by McLeodUSA, which consent will not be unreasonably withheld, prior to
the effective time of the merger, it will, and will cause its subsidiaries to,
carry on their respective businesses in the ordinary course and comply with all
applicable laws, rules and regulations and will use its commercially reasonable
efforts to preserve their assets and technology and their relationships with
customers, suppliers, licensors, licensees, distributors and others having
business dealings with them.

   In addition, CapRock has agreed that, except as expressly permitted in the
merger agreement and subject to certain exceptions, unless consented to in
writing by McLeodUSA, which consent will not be unreasonably withheld, neither
it nor any of its subsidiaries may, among other things:

  .  declare, set aside or pay any dividends or make other distributions in
     respect of any of its capital stock, other than certain dividends and
     distributions by a wholly-owned subsidiary to its parent

  .  split, combine or reclassify any of its capital stock, or issue or
     authorize the issuance of any other securities in respect of, in lieu of
     or in substitution for shares of its capital stock

  .  purchase, redeem or otherwise acquire, any shares of capital stock of
     CapRock or its subsidiaries or any rights, warrants, calls or options to
     acquire any such securities other than any purchase of CapRock common
     stock held for more than six months in connection with a cashless
     exercise of CapRock stock options

  .  issue, deliver, sell, pledge or otherwise encumber or subject to any
     lien any shares of its capital stock, any other voting securities or any
     securities convertible into, or exchangeable for, or any rights,
     warrants, calls or options to acquire, any such securities or any stock
     appreciation rights or other rights that are linked to the price of
     CapRock common stock other than (1) the issuance of CapRock common stock
     upon the exercise of CapRock stock options outstanding on the date of
     the merger agreement in accordance with their terms, (2) grants of
     CapRock stock options to existing employees, including executive
     officers, in amounts, to individuals and on terms as agreed by CapRock
     and McLeodUSA and (3) grants of CapRock stock options to new employees
     who are not executive officers in the ordinary course of business, to
     the extent that the aggregate number of shares of CapRock common stock
     issuable under such grants, does not exceed 350,000 in any calendar
     quarter on terms consistent with past practice, except that such options
     will be subject to four year vesting and such vesting will not
     accelerate upon completion of the merger

  .  amend the articles of incorporation, bylaws or other comparable
     organizational documents of CapRock or its subsidiaries

  .  directly or indirectly acquire or agree to acquire by merging or
     consolidating with, or by purchasing assets of, or by any other manner,
     any business or any person, other than purchases of raw materials or
     supplies in the ordinary course of business consistent with past
     practice

  .  directly or indirectly sell, lease, license, sell and leaseback,
     mortgage or otherwise encumber or subject to any lien or otherwise
     dispose of any of its properties or assets other than sales or licenses
     of goods in the ordinary course of business consistent with past
     practice or sales of any properties or assets of a wholly-owned
     subsidiary of CapRock to CapRock or another wholly-owned subsidiary

  .  incur any debt for borrowed money or guarantee any such debt of another
     person, issue or sell any debt securities or warrants or other rights to
     acquire any debt securities of CapRock or any of its subsidiaries,
     guarantee any debt securities of another person, enter into any "keep
     well" or other agreement to maintain any financial statement condition
     of another person or enter into any arrangement having the economic
     effect of any of the foregoing, except for (1) short-term borrowings
     incurred in the ordinary course of business consistent with past
     practice, (2) intercompany debt between CapRock and any of its
     subsidiaries or between such subsidiaries and (3) in connection with
     certain financing arrangements entered into in connection with the
     merger

                                       48
<PAGE>

  .  make any loans, advances or capital contributions to, or investments in,
     any other person, other than employee advances in the ordinary course of
     business consistent with past practice

  .  repay, redeem, repurchase or otherwise retire, or otherwise make any
     payment in respect of, any debt for borrowed money or any debt
     securities, or any rights, warrants, calls or options to acquire any
     debt securities, other than as required by their terms as in effect on
     the date of the merger agreement

  .  make any new capital expenditures, other than cash payments for capital
     expenditures, excluding capitalized selling, general and administrative
     costs and capitalized interest, in amounts not to exceed in the
     aggregate $100 million for the calendar quarter ending December 31, 2000
     and $80 million for the calendar quarter ending March 31, 2001

  .  pay, discharge, settle or satisfy any material claims, including claims
     of stockholders, liabilities, obligations or litigation, other than the
     payment, discharge, settlement or satisfaction in the ordinary course of
     business consistent with past practice or in accordance with its terms,
     of liabilities reflected or reserved against in the most recent
     consolidated financial statements of CapRock or incurred since the date
     of such financial statements

  .  waive the benefits of, or agree to modify in any material manner,
     terminate or fail to enforce, or consent to any material matter with
     respect to which its consent is required under, any confidentiality,
     standstill or similar agreement to which CapRock or any of its
     subsidiaries is a party or a beneficiary

  .  except as may be required to comply with applicable law, enter into,
     adopt or amend in any material respect or terminate any benefit plan,
     collective bargaining agreement or other union agreement or benefit
     agreement of CapRock, or materially change any actuarial or other
     assumption used to calculate funding obligations for any benefit plan,
     or change the manner in which contributions to any benefit plan are made
     or the basis on which such contributions are determined

  .  except for normal increases in cash compensation in the ordinary course
     of business consistent with past practice that, in the aggregate, do not
     materially increase benefits or compensation expenses of CapRock or its
     subsidiaries or increases required by applicable law, increase the
     compensation, bonus or other benefits of any director, officer or other
     employee or consultant or pay any benefit or amount not required by a
     benefit plan or arrangement as in effect on the date of the merger
     agreement to any such person, take any action to fund or in any other
     way secure the payment of compensation of benefits under any benefit
     agreement or benefit plan of CapRock or take any action to accelerate
     the vesting or payment of any compensation or benefit under any benefit
     agreement or benefit plan of CapRock, other than the completion of the
     merger or the exercise by McLeodUSA of its option to purchase CapRock
     common stock which generally will accelerate the vesting of the CapRock
     stock options, as required under the terms of the stock options, and of
     restricted shares of CapRock common stock, as required under the terms
     of various restricted stock agreements

  .  authorize, commit or agree to take, any of the actions described above

No Solicitation by CapRock

   The merger agreement provides that CapRock will not, nor will it permit any
of its subsidiaries to, nor will it authorize or permit any of its or their
directors, officers or employees or any investment banker, financial advisor,
attorney, accountant or other representative retained by it or any of its
subsidiaries to, directly or indirectly through another person

  .  solicit, initiate or encourage or take any other action designed to, or
     which reasonably could be expected to, facilitate, any inquiries or the
     making of any proposal that constitutes a takeover proposal as described
     below

  .  participate in any discussions or negotiations regarding, or furnish to
     any person any information with respect to, or otherwise cooperate in
     any way with respect to, any takeover proposal

                                       49
<PAGE>

   The merger agreement provides that the term "takeover proposal" means:

  .  any inquiry, proposal or offer from any person relating to, or that is
     reasonably likely to lead to, any direct or indirect acquisition or
     purchase of a business that constitutes 20% or more of the revenues, net
     income, EBITDA or assets of CapRock and its subsidiaries, taken as a
     whole, or 20% or more of any class or series of equity securities of
     CapRock or any of its subsidiaries

  .  any tender offer or exchange offer that if completed would result in any
     person beneficially owning 20% or more of any class or series of equity
     securities of CapRock or any of its subsidiaries

  .  any merger, consolidation, business combination, recapitalization,
     liquidation, dissolution or similar transaction involving CapRock or any
     of its subsidiaries in which any person would own 20% or more of CapRock
     or any resulting parent company of CapRock, in each case other than the
     transactions contemplated by the merger agreement.

   The merger agreement does not preclude CapRock from, prior to the holders of
a majority of the outstanding shares of CapRock common stock approving the
merger agreement, in response to a bona fide written takeover proposal, which
did not result from a breach of this provision of the merger agreement, that
the CapRock board of directors determines in good faith, after consultation
with outside counsel and a financial advisor of nationally recognized
reputation, constitutes or is reasonably likely to lead to a superior proposal,
to the extent that its board of directors determines in good faith, after
consultation with outside counsel, that it is appropriate to do so in order to
comply with its fiduciary duties to CapRock stockholders under applicable law,
subject to providing prior notice to McLeodUSA:

  .  furnishing under a customary confidentiality agreement information about
     CapRock and its subsidiaries to any person making such takeover proposal
     provided that all such information is also furnished to McLeodUSA

  .  participating in discussions or negotiations regarding such takeover
     proposal

   The merger agreement provides that the term "superior proposal" means any
bona fide, binding written offer not solicited by or on behalf of CapRock or
any of its subsidiaries made by any person that if completed would result in
such person owning, directly or indirectly, more than 50% of the then
outstanding shares of CapRock common stock, or of the surviving entity in a
merger or its parent, or all or substantially all the assets of CapRock and its
subsidiaries, taken as a whole, and otherwise on terms that the CapRock board
of directors determines in good faith, after consultation with a financial
advisor of nationally recognized reputation, taking into account the person
making the offer, the legal, financial, regulatory and other aspects of the
offer deemed appropriate by the CapRock board of directors and any changes to
the terms of the merger agreement proposed by McLeodUSA to be reasonably likely
to obtain any required approvals on a timely basis and to be more favorable to
CapRock stockholders from a financial point of view than the merger.

   Neither the CapRock board of directors nor any committee of the CapRock
board of directors will:

  .  withdraw, or modify in manner adverse to McLeodUSA, or propose publicly
     to withdraw, or modify in a manner adverse to McLeodUSA, the
     recommendation or declaration of advisability by the CapRock board of
     directors or such committee of the CapRock board of directors of the
     merger or the merger agreement

  .  recommend, or propose to recommend, the approval or adoption of any
     other takeover proposal

  .  adopt or approve, or propose publicly to adopt or approve, any takeover
     proposal or withdraw, or propose to withdraw, its approval of the merger
     and the merger agreement

  .  approve or recommend, or propose to approve or recommend, or execute or
     enter into any letter of intent, agreement in principle, acquisition
     agreement, memorandum of understanding, merger agreement, option
     agreement, joint venture agreement, partnership agreement or other
     similar agreement related to or that is reasonably likely to lead to any
     takeover proposal

                                       50
<PAGE>

provided, however, that at any time prior to the holders of a majority of the
outstanding shares of CapRock common stock approving the merger agreement, the
CapRock board of directors may, in response to a superior proposal that was
unsolicited after the date of the merger agreement and that did not result from
a breach of the no solicitation provisions described above, withdraw its
recommendation of the merger agreement and the merger and recommend the
approval of a superior proposal to the extent that the CapRock board of
directors determines in good faith, after consultation with outside counsel,
that it is necessary to do so in order to comply with its fiduciary duties to
CapRock stockholders under applicable law, except that no withdrawal of the
CapRock board of directors' recommendation of the merger agreement and
recommendation of a superior proposal may be made without providing three
business days' written notice to McLeodUSA.

   In addition to the obligations of the "no solicitation" provisions described
above, the merger agreement provides that CapRock will immediately advise
McLeodUSA orally and in writing of any request for information or of any
takeover proposal, or of any inquiry CapRock reasonably believes could lead to
a takeover proposal, the terms and conditions of such request, takeover
proposal or inquiry and the identity of the person making such request,
takeover proposal or inquiry. CapRock will keep McLeodUSA informed on a prompt
basis of the status and details, including amendments or changes or proposed
amendments or changes, of any such request, takeover proposal or inquiry.

   Nothing in the merger agreement prohibits the CapRock board of directors
from taking and disclosing to CapRock stockholders a position contemplated by
Rules 14d-9 and 14e-2 promulgated under the Securities Exchange Act or from
making any disclosure to CapRock stockholders if, in the good faith judgment of
the CapRock board of directors, after consultation with outside counsel,
failure to disclose would be inconsistent with its obligations under applicable
law, except that in no event will CapRock or its board of directors take or
agree to take any action contrary to the no solicitation provisions in the
merger agreement.

Directors' and Officers' Insurance and Indemnification

   McLeodUSA and Cactus Acquisition Corp. have agreed that all rights to
indemnification and exculpation from liabilities for acts or omissions
occurring at or prior to the effective time, and rights for advancement of
expenses, existing in favor of the current or former directors or officers,
employees or agents of CapRock and its subsidiaries as provided for in their
respective articles or certificates of incorporation or bylaws, or comparable
organizational documents, and any indemnification or other similar agreements
of CapRock as in effect as of the date of the merger agreement will be assumed
by the surviving corporation in the merger at the effective time and will not
be amended, repealed or otherwise modified after the effective time in any
manner that would adversely affect the rights of the individuals who on or
prior to the effective time were directors, officers, employees or agents of
CapRock or its subsidiaries, and McLeodUSA will, and will cause the surviving
corporation to, including, if necessary, by providing the surviving corporation
with sufficient funding, honor all such indemnification provisions.

   The merger agreement provides that for six years after the effective time of
the merger, McLeodUSA will, and will cause the surviving corporation in the
merger to, including, if necessary, by providing such surviving corporation
with sufficient funding, maintain directors' and officers' liability insurance
for acts or omissions occurring prior to the effective time of the merger
covering those persons who were, as of the date of the merger agreement,
covered by CapRock's directors' and officers' liability insurance policy, on
terms no less favorable than those in effect on the date of the merger
agreement. McLeodUSA's obligation to provide this insurance coverage is subject
to a cap of 200% of the current annual premium paid by CapRock for its existing
insurance coverage. If McLeodUSA cannot maintain the existing or equivalent
insurance coverage without exceeding the 200% cap, McLeodUSA is required to
maintain only that amount of insurance coverage which can be obtained by paying
an annual premium equal to the 200% cap.

   McLeodUSA has further agreed that, if the surviving corporation in the
merger were to consolidate or merge with another entity and not be the
surviving entity of such consolidation or merger or transfers or conveys all or
substantially all of its property to any person, its successors will assume
these obligations.

                                       51
<PAGE>

Conditions to Completion of the Merger

   Each party's obligation to effect the merger is subject to the satisfaction
or waiver of various conditions which include, in addition to other customary
closing conditions, the following:

  .  holders of a majority of the outstanding shares of CapRock common stock
     having approved the merger agreement (holders of such a majority have
     agreed to approve the merger agreement)

  .  the waiting period applicable to the merger under the HSR Act having
     expired or been terminated

  .  McLeodUSA and CapRock must have received reasonably satisfactory
     evidence that each party has obtained all material consents, approvals
     or authorizations of governmental entities legally required in
     connection with the transactions contemplated by the merger agreement
     and all other consents, approvals or authorizations required in
     connection with the transactions contemplated by the merger agreement,
     except where the failure to obtain such other consents or authorizations
     could not reasonably be likely to have a material adverse effect on
     either McLeodUSA or CapRock

  .  no judgment, order, decree, injunction, statute, law, ordinance, rule or
     regulation, entered, enacted, promulgated, enforced or issued by any
     court or other governmental entity of competent jurisdiction or other
     legal restraint or prohibition is in effect, and there is not pending
     any suit, action or proceeding by any governmental entity, (1)
     preventing, or seeking to prevent, the completion of the merger or (2)
     which otherwise could reasonably be expected to have a material adverse
     effect on either McLeodUSA or CapRock

  .  the registration statement of which this proxy statement/prospectus
     forms a part having been declared effective under the Securities Act and
     no stop order suspending its effectiveness will have been issued and no
     proceedings for that purpose will have been initiated or threatened by
     the SEC

  .  McLeodUSA will have received all federal or state securities permits and
     other authorizations necessary to issue McLeodUSA Class A common stock
     in, and to complete, the merger

  .  the shares of McLeodUSA Class A common stock issuable to CapRock
     stockholders in the merger having been approved for quotation on the
     Nasdaq National Market, subject to official notice of issuance

   In addition, each party's obligation to effect the merger is further subject
to the satisfaction or waiver of the following additional conditions:

  .  the representations and warranties of each other party set forth in the
     merger agreement that are qualified as to materiality being true and
     correct, and those that are not qualified as to materiality being true
     and correct in all material respects, in each case as of the date of the
     merger agreement and as of the date on which the merger is to be
     completed with the same effect as though made on and as of the date on
     which the merger is to be completed, or, if such representations and
     warranties expressly relate to an earlier date, then as of such date

  .  each other party to the merger agreement having performed in all
     material respects all obligations required to be performed by it under
     the merger agreement on or prior to the date on which the merger is to
     be completed

  .  with respect only to CapRock's obligation to effect the merger, CapRock
     having received from Munsch Hardt Kopf & Harr, P.C. on the date on which
     the registration statement is filed with the SEC and on the date on
     which the merger is to be completed, an opinion in each case dated as of
     such respective date and stating that the merger will qualify for United
     States federal income tax purposes as a reorganization within the
     meaning of Section 368(a) of the Internal Revenue Code

  .  with respect only to CapRock's obligation to effect the merger,
     McLeodUSA must have performed all material payment obligations under
     certain financing arrangements entered into in connection with the
     merger agreement, McLeodUSA must not be in default under any such
     financing arrangements and

                                       52
<PAGE>

     such financing arrangements must be in full force and effect as of the
     date on which the merger is to be completed

  .  with respect only to McLeodUSA's obligation to effect the merger,
     CapRock must have obtained the requisite consents to make the amendments
     described under "The Merger--CapRock Debt Securities," to the indentures
     governing CapRock's public debt in form and substance satisfactory to
     McLeodUSA in its sole discretion and the indenture trustees will have
     executed such amendments

   The merger agreement provides that a "material adverse change" or "material
adverse effect" means, when used in connection with CapRock or McLeodUSA, any
change, effect or event that, individually or when taken together with all
other such changes, effects or events, is or is reasonably likely to be
materially adverse to the business, operations, condition (financial or
otherwise), assets or liabilities of a person and its subsidiaries, taken as a
whole, other than:

  .  adverse effects caused by changes in the economy generally or in
     securities markets generally or in such person's industry, and those of
     its subsidiaries, in general and not specifically relating to such
     entity

  .  the loss of personnel or suppliers or the delay or cancellation of
     orders for the person's services or similar occurrences which are the
     direct and proximate result of the announcement of the merger agreement

  .  certain other events set forth in the merger agreement

  .  litigation brought by or threatened against such person or any member of
     its board of directors based upon the merger agreement

Termination of the Merger Agreement

   The merger agreement may be terminated at any time prior to the effective
time of the merger, even if the merger agreement has been approved by CapRock
stockholders:

  .  by mutual written consent of CapRock and McLeodUSA

  .  by either McLeodUSA or CapRock, if the CapRock stockholders do not
     approve the merger agreement

  .  by either McLeodUSA or CapRock, if the merger has not been completed by
     March 31, 2001, except that this right to terminate the merger agreement
     will not be available to any party whose failure to perform any of its
     obligations under the merger agreement has resulted in the failure of
     the merger to occur on or before that date

  .  by either McLeodUSA or CapRock, if there is any law or regulation that
     makes completion of the merger illegal or prohibited or if any decree,
     judgment, injunction, order or other action by any governmental entity
     having competent jurisdiction prohibiting completion of the merger will
     have become final and non-appealable, after the party seeking to
     terminate the merger agreement under this provision has used its
     commercially reasonable efforts to prevent the entry of and to remove
     such law, regulation, decree, judgment, injunction or order

  .  by either McLeodUSA or CapRock, if the other party has breached in any
     material respect any of its representations, warranties or covenants or
     other agreements contained in the merger agreement, which breach or
     failure to perform would give rise to the failure of a condition to the
     merger described in the eighth and ninth bullet points under "--
     Conditions to Completion of the Merger" and has not been or cannot be
     cured within 30 calendar days after receiving written notice from the
     other party

  .  by McLeodUSA, if the CapRock board of directors withdraws, or modifies
     in a manner adverse to McLeodUSA, its recommendation of the merger
     agreement and the merger or recommends another takeover proposal

                                      53
<PAGE>

  .  by McLeodUSA, if CapRock has not obtained the requisite consents to the
     amendments of the indentures governing CapRock's public debt described
     under "The Merger--CapRock Debt Securities" and such indenture trustees
     have not executed such amendments or waivers within 30 days following
     the date of the merger agreement

  .  by CapRock, if McLeodUSA has breached or failed to perform in any
     material respect any of its covenants or other agreements contained in
     certain financing arrangements entered into in connection with the
     merger agreement and has not cured the breach or failure within 30 days
     after written notice

Expenses; Termination Fee

   The merger agreement provides that each party will pay its own costs and
expenses in connection with the merger agreement and the transactions
contemplated by the merger agreement, except that McLeodUSA and CapRock will
each pay one-half of the expenses incurred in connection with the filing,
printing and mailing of this proxy statement/prospectus and the filing fees for
the premerger notification and report forms under the HSR Act.

   CapRock must pay to McLeodUSA a termination fee of $7.85 million if:

  .  CapRock or its stockholders receive a takeover proposal or a takeover
     proposal otherwise becomes publicly known and

  .  either CapRock or McLeodUSA then terminates the merger agreement because
     the merger has not been completed by March 31, 2001 or the CapRock
     stockholders do not approve the merger agreement or McLeodUSA terminates
     the merger agreement because the CapRock board of directors has
     withdrawn, or modified in a manner adverse to McLeodUSA, its
     recommendation of the merger agreement and the merger or has recommended
     another takeover proposal and

  .  CapRock or any of its subsidiaries enters into an agreement for any
     takeover proposal (for purposes of this provision only, "takeover
     proposal" has the same meaning as under "--No Solicitation by CapRock",
     except that references to 20% are deemed references to 30%) within 12
     months of the termination of the merger agreement

Waiver and Amendment of the Merger Agreement

   Waiver. At any time prior to the effective time of the merger, any party to
the merger agreement may, as to the other parties, agree to:

  .  extend the time for the performance of any obligation or other act
     required to be performed under the merger agreement

  .  waive any inaccuracies in the representations and warranties contained
     in the merger agreement or in any document delivered in accordance with
     the merger agreement

  .  waive compliance with any of the agreements or conditions contained in
     the merger agreement, unless the CapRock stockholders have already
     approved the merger agreement and, then any waiver which requires
     further stockholder approval will not be made without such approval

   Amendment. The merger agreement may be amended by the parties to the merger
agreement at any time prior to the effective time of the merger. However, once
the CapRock stockholders have approved the merger agreement, they must also
approve any subsequent amendment if the amendment, by law, requires further
approval by the CapRock stockholders.

Voting Agreements

   Several CapRock stockholders have entered into agreements with respect to
the voting of their shares of CapRock common stock in connection with the
merger agreement. Under the terms of these agreements, until

                                       54
<PAGE>

the date on which the merger is completed or the merger agreement is terminated
in accordance with its terms, each such person has agreed, among other things:

  .  to vote, or cause to be voted, the shares of CapRock common stock owned
     beneficially or of record by such person at any meeting of CapRock
     stockholders in favor of the approval of the merger agreement

  .  to vote, or cause to be voted, the shares of CapRock common stock owned
     beneficially or of record by such person at any meeting of CapRock
     stockholders against any takeover proposal or any amendment to the
     CapRock articles of incorporation or bylaws or other proposal, action or
     transaction involving CapRock or any of its subsidiaries or its
     stockholders that could reasonably be expected to prevent or materially
     impede or delay the completion of the merger

  .  to grant to McLeodUSA, or the persons designated by the McLeodUSA board
     of directors proxies and appoint such persons as attorneys-in-fact to
     vote the shares of CapRock common stock owned beneficially or of record
     by such person in favor of the approval of the merger agreement and
     against any takeover proposal or any amendment to the CapRock articles
     of incorporation or bylaws or other proposal, action or transaction
     involving CapRock or any of its subsidiaries or its stockholders that
     could reasonably be expected to prevent or materially impede or delay
     the completion of the merger

  .  not to sell, transfer, pledge, assign or otherwise dispose of, including
     by gift, any of the shares of CapRock common stock owned by such person
     (except pursuant to the option described below)

  .  not to grant any proxies, deposit any shares of CapRock common stock
     into a voting trust or enter into another voting agreement with respect
     to any shares of CapRock common stock

  .  not to take any action which would have the effect of preventing or
     inhibiting such person from performing its obligations under the voting
     agreement

  .  not to, nor permit any of its subsidiaries to, authorize or permit any
     of the directors, officers, employees or partners of such person or any
     of its subsidiaries to, directly or indirectly, solicit, initiate or
     encourage or take any other action designed to facilitate, any takeover
     proposal

   By entering into these agreements, the holders of approximately 52% of the
outstanding shares of CapRock common stock entitled to vote at the special
meeting have agreed to vote in favor of the approval of the merger agreement
and against any takeover proposal.

Grant of Option

   A number of the CapRock stockholders who have entered into the above-
described agreements with respect to the voting of their shares of CapRock
common stock, representing approximately 39% of the outstanding shares of
CapRock common stock, have granted to McLeodUSA an irrevocable option to
purchase the shares of CapRock common stock that are owned beneficially or of
record by such stockholders pursuant to a voting and option agreement.

   McLeodUSA may exercise the option if, on or after the date of the merger
agreement, any corporation, partnership, individual, trust or any person other
than McLeodUSA or any of its affiliates shall have:

  .  commenced or announced an intention to commence a bona fide tender offer
     or exchange offer for any shares of CapRock common stock, the result of
     which would result in the beneficial ownership by such person of 20% or
     more of the then voting equity of CapRock

  .  filed a form under the HSR Act reflecting an intent to acquire CapRock
     or any of its assets or securities

  .  solicited proxies in a solicitation subject to the proxy rules under the
     Securities Exchange Act, executed any written consent or become a
     participant in any solicitation with respect to CapRock common stock

                                       55
<PAGE>

   McLeodUSA may also exercise the option if, on or after the date of the
merger agreement:

  .  CapRock stockholders do not approve the merger agreement

  .  the CapRock board of directors withdraws, or modifies in a manner
     adverse to McLeodUSA, its recommendation of the merger agreement and the
     merger or recommends another takeover proposal

  .  any other event occurs which would require CapRock to pay McLeodUSA the
     termination fee provided for in the merger agreement, but without the
     necessity of McLeodUSA having terminated the merger agreement

  .  the person who granted McLeodUSA the option commits a material breach of
     its obligations described under "--Voting Agreements"

   The option is payable in cash or stock, at the discretion of McLeodUSA, at
an exercise price per share equal to:

  .  if in cash, 0.3876 (the exchange ratio in the merger) multiplied by the
     average closing price of McLeodUSA Class A common stock for the five
     trading days preceding the date on which the option is exercised or

  .  if in stock, 0.3876 of a share of McLeodUSA Class A common stock

   The voting and option agreement provides that the aggregate cash exercise
price paid to a stockholder when aggregated with all other cash purchases of
CapRock common stock by McLeodUSA will be limited to that amount of cash that
would permit any subsequent acquisition of CapRock by McLeodUSA that occurs to
qualify as a tax free reorganization under Section 368(a) of the Internal
Revenue Code. Furthermore, if McLeodUSA exercises the option and CapRock within
12 months thereafter completes any takeover proposal, McLeodUSA will pay to
such CapRock stockholder an amount of additional consideration equal to 50% of
the difference between the aggregate price paid by McLeodUSA upon exercise of
the option and the aggregate amount received by McLeodUSA in the takeover
proposal for the shares of CapRock common stock purchased by McLeodUSA upon
exercise of the option.

   McLeodUSA may exercise the option in whole or in part, at its discretion.
However, if it elects to exercise the option only in part, McLeodUSA must
purchase the total number of shares it is seeking pro rata from the CapRock
stockholders who have granted the option to McLeodUSA.

   Prior to the termination of the option, the stockholder may not, without the
consent of McLeodUSA, sell, transfer, pledge, assign or otherwise dispose of
any of the shares of CapRock common stock that are subject to the option or
take any other action that would prevent the stockholder from fulfilling its
obligations in connection with the grant of the option.

   The option will terminate upon the earliest of:

  .  the effective time of the merger

  .  the termination of the merger agreement other than as described
     immediately below

  .  nine months following the termination of the merger agreement if the
     merger agreement is terminated:

    .  by either McLeodUSA or CapRock because the CapRock stockholders do
       not approve the merger agreement

    .  by McLeodUSA because the CapRock board of directors withdraws, or
       modifies in a manner adverse to McLeodUSA, its recommendation of the
       merger agreement and the merger or recommends another takeover
       proposal

                                       56
<PAGE>

Credit Agreement

   In connection with the merger agreement, CapRock Fiber and CapRock
Telecommunications, as borrowers, CapRock and The Chase Manhattan Bank, as
lender and administrative agent, entered into a credit agreement as of October
2, 2000, for a revolving credit facility of up to $100 million. The principal
terms of the facility are described below:

   Availability. The availability under the facility is up to:

  .  $50 million from October 2, 2000 to December 31, 2000

  .  $100 million from January 1, 2001 to the maturity date of May 30, 2001

   Rates and Fees. Loans under the facility bear interest, depending on the
type of loan, at:

  .  adjusted base rate plus 3.5% per year or

  .  the London interbank offered rate plus 4.5% per year

   The commitment fee is:

  .  for each day on which CapRock uses 50% or less of the total amount
     available under the credit agreement, 1.50% of undrawn amounts

  .  for each day on which CapRock uses 75% or less of the total amount
     available under the credit agreement, 1.25% of undrawn amounts

  .  for each day on which CapRock uses more than 75% of the total amount
     available under the credit agreement, 1.00% of undrawn amounts

   Prepayment. CapRock may at its option prepay any borrowings at par at any
time. Mandatory prepayments are required upon:

  .  the sale, transfer or other disposition of certain assets of CapRock or
     any of its subsidiaries

  .  the receipt of any casualty or insurance proceeds by CapRock or any of
     its subsidiaries, subject to exceptions or

  .  the receipt by CapRock or any of its subsidiaries of proceeds from debt
     or equity offerings

   Security. The facility is secured by a guarantee by CapRock and its domestic
non-borrower subsidiaries, a pledge of the stock held by CapRock and its
domestic subsidiaries and a security agreement covering substantially all of
the available assets of CapRock and its domestic subsidiaries.

   Covenants. The covenants in the credit agreement limit CapRock's ability,
directly or through subsidiaries, to:

  .  breach the merger agreement in a manner involving an intentional
     misrepresentation, fraud, bad faith or willful misconduct

  .  fail to provide notices of material events or furnish certain financial
     and other information

  .  incur additional indebtedness or liens or enter into sale/leaseback
     transactions

  .  pay dividends or make other distributions, other than stock dividends or
     to fund administrative expenses or existing indebtedness

  .  make investments

  .  repurchase equity interests or subordinated obligations

  .  consummate asset sales

                                       57
<PAGE>

  .  enter into transactions with affiliates

  .  engage in any business other than a telecommunications business or other
     business conducted on the date of the credit agreement

  .  merge or consolidate with any other person other than with McLeodUSA, or
     sell, assign, transfer, lease, convey or otherwise dispose of all or
     substantially all of its assets

   In addition, CapRock must satisfy financial covenants, including those
relating to:

  .  minimum access lines in service

  .  maximum consolidated senior secured debt to contributed capital

  .  minimum consolidated revenue

  .  minimum EBITDA

Other Agreements

   Indefeasible Right of Use Agreement. McLeodUSA agreed to pay $29.3 million
to CapRock to acquire rights to dark fibers from CapRock through an
indefeasible right of use (IRU) agreement signed on October 19, 2000. This
agreement is based on arm's length negotiations and includes the following
terms:

  .  initial payment of $19.3 million at signing, with the balance due upon
     acceptance of fibers

  .  IRU includes: fibers on the ring encompassing Dallas to Monroe, LA to
     Little Rock to Tulsa to Oklahoma City back to Dallas with an additional
     overlay of fibers on the Dallas to Little Rock segment (via Oklahoma
     City and Tulsa)

  .  in addition to dark fibers, the IRU includes certain rights for
     McLeodUSA in associated conduit and colocation space of CapRock

  .  McLeodUSA has rights to swap or exchange some of the fibers for dark
     fibers in other CapRock routes

  .  McLeodUSA also has a first right of refusal on additional fibers when
     CapRock's remaining available fibers on specified routes reach defined
     levels

  .  CapRock and McLeodUSA each retain specified demand rights relative to
     the fibers covered by the IRU that have not been lit

   Master Services Agreement. McLeodUSA and CapRock have discussed entering
into a master services agreement with a one-year term under which CapRock will
lease DS-1, DS-3 and/or OC-N telecommunications capacity to McLeodUSA at
various specified prices. Up to 50,000 DS-3 miles potentially may be swapped or
exchanged between the parties for equal or similarly valued capacity along each
other's telecommunications system. There can be no assurance that the parties
will enter into any such agreement.

                                       58
<PAGE>

            INFORMATION ABOUT McLEODUSA AND CACTUS ACQUISITION CORP.

General

   McLeodUSA provides selected telecommunications services to customers
nationwide. McLeodUSA provides integrated communications services, including
local services, in many Midwest and Rocky Mountain states and long distance and
advanced data services in all 50 states. McLeodUSA is a facilities-based
telecommunications provider with 361 ATM switches, 37 voice switches, nearly
824,000 local lines and more than 9,000 employees. McLeodUSA expanded its
marketplace for advanced data and Internet services to all 50 states through
its March 30, 2000 acquisition of Splitrock Services. The network acquired in
the Splitrock transaction is capable of transmitting integrated next-generation
data, video and voice services, reaching 800 cities and 90% of the U.S.
population. In the next 12 months, McLeodUSA plans to distribute 30 million
telephone directories in 26 states, serving a population of 51 million.
McLeodUSA is a Nasdaq-100 company traded under the symbol "MCLD."

   McLeodUSA offers local, long distance, Internet access, data, voice mail and
paging services from a single company on a single bill. McLeodUSA believes it
is the first company in many of its markets to offer one-stop shopping for
communications services tailored to customers' specific needs.

   McLeodUSA's core business is providing communications services in
competition with existing local telephone companies, including:

  .  local and long distance services

  .  dial and dedicated Internet access

  .  higher bandwidth Internet access services, such as digital subscriber
     line (DSL) and cable modem

  .  value-added services such as virtual private networks and web hosting

  .  bandwidth leasing and colocation services

  .  facilities and services dedicated for a particular customer's use

  .  telephone and computer sales, leasing, networking, service and
     installation

  .  other communications services, including video, cellular, operator,
     payphone, mobile radio, wireless communications and paging services

   McLeodUSA also derives revenue from the following services related to its
core business:

  .  sale of advertising in print and electronic telephone directories

  .  traditional local telephone company services in east central Illinois
     and southeast South Dakota

  .  telemarketing services

   In most of its local service markets, McLeodUSA competes with the existing
local phone company by leasing its lines and switches. In certain limited local
service markets in Illinois, Iowa, Minnesota and South Dakota, McLeodUSA
operates its own lines and switches. McLeodUSA provides long distance services
by using its own communications network facilities and leasing capacity from
long distance and local communications providers.

   McLeodUSA has developed and continues to develop fiber optic communications
networks in many of its target local markets in the Midwest and Rocky Mountain
regions to carry additional communications traffic on its own network.
McLeodUSA is actively developing enhancements to its national network and
associated next-generation services.

   McLeodUSA owns and operates a broadband access network that is marketed to
various businesses throughout the United States. As part of its ongoing efforts
to enhance its network and data services,

                                       59
<PAGE>

McLeodUSA is acquiring indefeasible rights to use dark fiber optic strands in a
nationwide network that will cover more than 15,000 route miles. This national
network allows McLeodUSA to transmit integrated next-generation data, video and
voice services on both a retail and wholesale basis, provides increased control
and service quality and establishes a base for growth.

   McLeodUSA wants to be the leading and most admired provider of integrated
communications services in its markets. To achieve this goal, McLeodUSA is:

  .  aggressively capturing customer share and generating revenue using
     leased communications network capacity

  .  concurrently building its own communications network

  .  migrating customers to its own communications network to provide
     enhanced services and reduce operating costs

   The principal elements of the business strategy of McLeodUSA are to:

   Provide integrated communications services. McLeodUSA believes it can
rapidly penetrate its target markets and build customer loyalty by providing an
integrated product offering to business and residential customers.

   Build customer share through branding. McLeodUSA believes it can create and
strengthen brand awareness in its target markets by branding its communications
services with the trade name McLeodUSA in combination with the distinctive
black-and-yellow motif of its telephone directories.

   Provide outstanding customer service. McLeodUSA customer service
representatives are available 24 hours a day, seven days a week, to answer
customer calls. The customer-focused software and systems of McLeodUSA allow
its representatives immediate access to its customer and network data, enabling
a rapid and effective response to customer requests.

   Emphasize small and medium sized businesses. McLeodUSA primarily targets
small and medium sized businesses because it believes it can rapidly capture
customer share by providing face-to-face business sales and strong service
support to these customers.

   Expand its fiber optic communications network. McLeodUSA is building a
state-of-the-art fiber optic communications network to deliver multiple
services and reduce operating costs.

   Expand its intra-city fiber optic communications network. Within selected
cities, McLeodUSA plans to extend its network directly to its customers'
locations. This will allow McLeodUSA to provide expanded services and reduce
the expense of leasing communications facilities from the local exchange
carrier.

   Explore acquisitions and strategic alliances. McLeodUSA plans to pursue
acquisitions, joint ventures and strategic alliances to expand or complement
its business.

   Leverage proven management team. The McLeodUSA executive management team
consists of veteran telecommunications managers who successfully implemented
similar customer-focused telecommunications strategies in the past.

   As of June 30, 2000, McLeodUSA estimated, based on the combined McLeodUSA
and CapRock business plans, capital requirements and growth projections as of
that date, that McLeodUSA would require approximately $1.7 billion through 2002
to fund its planned capital expenditures and operating expenses. McLeodUSA
expects to meet these funding needs through the existing cash balances of
McLeodUSA and

                                       60
<PAGE>

CapRock, McLeodUSA's existing lines of credit and income from future
operations. The estimated aggregate capital requirements of McLeodUSA include
the projected cost of:

  .  expanding its fiber optic communications network, including national and
     intra-city fiber optic communications networks

  .  adding voice and ATM switches

  .  expanding operations in existing and new markets

  .  developing wireless services in limited markets

  .  funding general corporate purposes

  .  completing recent acquisitions, including the merger

  .  constructing, acquiring, developing or improving telecommunications
     assets

   The projected funding plan assumes that (a) the indentures governing the
CapRock 12% senior notes due 2008 and the CapRock 11 1/2% senior notes due 2009
are amended to provide that the acquisition of CapRock does not constitute a
change of control and (b) such notes will either remain outstanding as amended
to remove various covenants or be exchanged for a like principal amount of
notes of McLeodUSA pursuant to the terms of the exchange offers. McLeodUSA may
meet any additional capital needs by issuing additional debt or equity
securities or borrowing funds from one or more lenders.

   The actual amount and timing of the future capital requirements of McLeodUSA
are subject to risks and uncertainties and may differ materially from its
estimates. Accordingly, McLeodUSA may need additional capital to continue to
expand its markets, operations, facilities, network and services. See "Risk
Factors--Failure to Raise Necessary Capital Could Restrict the Ability of
McLeodUSA to Develop Its Network and Services and Engage in Strategic
Acquisitions."

                               ----------------

   The principal executive offices of McLeodUSA are located at McLeodUSA
Technology Park, 6400 C Street SW, P.O. Box 3177, Cedar Rapids, Iowa 52406-
3177, and its phone number is (319) 790-7800.

   Cactus Acquisition Corp. Cactus Acquisition Corp. is a Delaware corporation
and a wholly-owned subsidiary of McLeodUSA. McLeodUSA formed Cactus Acquisition
Corp. on September 28, 2000 to facilitate the merger. Cactus Acquisition Corp.
has not transacted any business other than that incident to its formation and
to completion of the merger.

Additional Information

   A detailed description of the McLeodUSA business, executive compensation,
various benefit plans, including stock option plans, voting securities and the
principal holders of these securities, relationships and transactions between
McLeodUSA and its directors, executive officers and principal stockholders,
financial statements and other matters related to McLeodUSA is incorporated by
reference or set forth in the McLeodUSA Annual Report on Form 10-K for the year
ended December 31, 1999 and the McLeodUSA Quarterly Reports on Form 10-Q for
the quarters ended March 31, 2000 and June 30, 2000, incorporated by reference
into this proxy statement/prospectus. Stockholders desiring copies of these
documents may contact McLeodUSA at its address or telephone number indicated
under "Where You Can Find More Information."

                                       61
<PAGE>

               SELECTED CONSOLIDATED FINANCIAL DATA OF McLEODUSA

   The information in the following unaudited table is based on historical
financial information included in the prior SEC filings of McLeodUSA, including
the McLeodUSA Annual Report on Form 10-K for the fiscal year ended December 31,
1999 and the Quarterly Report on Form 10-Q for the quarter ended June 30, 2000.
The following summary financial information should be read in connection with
this historical financial information including the notes which accompany such
financial information. This historical financial information is considered a
part of this document. See "Where You Can Find More Information." The audited
historical financial statements of McLeodUSA as of December 31, 1999, 1998 and
1997, and for each of the three years in the period ended December 31, 1999
were audited by Arthur Andersen LLP, independent public accountants.

   The information in the following table reflects financial information for
the following companies McLeodUSA has acquired:

<TABLE>
<CAPTION>
       Acquired Company                                         Date Acquired
       ----------------                                       ------------------
   <S>                                                        <C>
   MWR Telecom, Inc. ........................................ April 28, 1995
   Ruffalo, Cody & Associates, Inc. ......................... July 15, 1996
   Telecom*USA Publishing Group, Inc......................... September 20, 1996
   Consolidated Communications, Inc. ........................ September 24, 1997
   Ovation Communications, Inc............................... March 31, 1999
   Splitrock Services, Inc. ................................. March 30, 2000
</TABLE>

   The operations statement data and other financial data in the table include
the operations of these companies beginning on the dates they were acquired.
The balance sheet data in the table include the financial position of these
companies at the end of the periods presented. These acquisitions affect the
comparability of the financial data for the periods presented.

   The pro forma information presented in the operations statement data and
other financial data in the table includes the operations of Ovation, Splitrock
and CapRock as if they had been acquired at the beginning of the periods
presented and the as adjusted information in the balance sheet data in the
table includes the Ovation, Splitrock and CapRock financial position as of the
date presented. The 1999 pro forma amounts include adjustments to the CapRock
1999 historical financial statements to give effect to the issuance by CapRock
in May 1999 of $210 million of its 11 1/2% senior notes as if the note issuance
had occurred at the beginning of such period.

   The information in the table also reflects the following debt and equity
securities that McLeodUSA has outstanding:

<TABLE>
<CAPTION>
        Description of Securities         Principal Amount    Date Issued
        -------------------------         ---------------- ------------------
   <S>                                    <C>              <C>
   10 1/2% senior discount notes due
    March 1, 2007........................   $500 million   March 4, 1997
   9 1/4% senior notes due July 15,
    2007.................................   $225 million   July 21, 1997
   8 3/8% senior notes due March 15,
    2008.................................   $300 million   March 10, 1998
   9 1/2% senior notes due November 1,
    2008.................................   $300 million   October 30, 1998
   8 1/8% senior notes due February 15,
    2009.................................   $500 million   February 22, 1999
   Series A preferred stock..............   $287 million   August 23, 1999
   Series B preferred stock..............   $687 million   September 15, 1999
   Series C preferred stock..............   $313 million   September 15, 1999
   Senior Secured Credit Facilities......   $575 million   May 30, 2000
</TABLE>

   The operations statement data and other financial data in the table include
the effects of the issuances beginning on the dates the securities were issued.
The balance sheet data in the table include the effects of these issuances at
the end of the periods presented. The pro forma information presented in the
operations

                                       62
<PAGE>

statement data and other financial data in the table includes the effects of
the issuance of the 8 1/8% senior notes, the Series A, B and C preferred stock
and the Senior Secured Credit Facilities as if they had occurred at the
beginning of 1999.

   On June 30, 1999, McLeodUSA announced that its board of directors had
declared a two-for-one stock split to be effected in the form of a stock
dividend. The record date for the stock split was July 12, 1999. Stockholders
of record at the market close on that date received one additional share of
McLeodUSA Class A common stock for each share held. Distribution of the
additional shares took place on July 26, 1999. On February 29, 2000, McLeodUSA
announced that its board of directors had declared a three-for-one stock split
to be effected in the form of a stock dividend. The record date for the stock
split was April 4, 2000. Stockholders of record at the market close on that
date received two additional shares of McLeodUSA Class A common stock for each
share held. Distribution of the additional shares took place on April 24, 2000.
All information in the selected consolidated financial data has been adjusted
to reflect the two-for-one stock split and the three-for-one stock split.

                                                 (table begins on the next page)

                                       63
<PAGE>

               Selected Consolidated Financial Data of McLeodUSA
                     (In thousands, except per share data)

<TABLE>
<CAPTION>
                                            Year Ended December 31,
                         -------------------------------------------------------------------
                                                                                  Pro Forma
                           1995       1996      1997        1998        1999        1999
                         ---------  --------  ---------  ----------  ----------  -----------
                                                                                 (unaudited)
<S>                      <C>        <C>       <C>        <C>         <C>         <C>
Operations Statement
 Data:
Revenue................. $  28,998  $ 81,323  $ 267,886  $  604,146  $  908,792  $1,210,667
Operating expenses:
 Cost of service........    19,667    52,624    151,190     323,208     457,085     699,401
 Selling, general and
  administrative........    18,054    46,044    148,158     260,931     392,687     481,488
 Depreciation and
  amortization..........     1,835     8,485     33,275      89,107     190,695     346,131
 Other..................       --      2,380      4,632       5,575         --          --
                         ---------  --------  ---------  ----------  ----------  ----------
 Total operating
  expenses..............    39,556   109,533    337,255     678,821   1,040,467   1,527,020
Operating loss..........   (10,558)  (28,210)   (69,369)    (74,675)   (131,675)   (316,353)
Interest income
 (expense), net.........      (771)    5,369    (11,967)    (52,234)    (94,244)   (191,068)
Other income............       --        495      1,426       1,997       5,637       7,163
Income taxes............       --        --         --          --          --          --
                         ---------  --------  ---------  ----------  ----------  ----------
Net loss................   (11,329)  (22,346)   (79,910)   (124,912)   (220,282)   (500,528)
Preferred stock
 dividends..............       --        --         --          --      (17,727)    (54,375)
                         ---------  --------  ---------  ----------  ----------  ----------
Loss applicable to
 common stock........... $(11,329)  $(22,346) $(79,910)  $(124,912)  $(238,009)  $ (554,633)
                         =========  ========  =========  ==========  ==========  ==========
Loss per common share... $   (.07)  $   (.09) $   (.24)  $    (.33)  $    (.54)  $     (.99)
                         =========  ========  =========  ==========  ==========  ==========
Weighted average common
 shares outstanding.....   168,024   243,036    329,844     376,842     443,130     559,751
                         =========  ========  =========  ==========  ==========  ==========
</TABLE>

<TABLE>
<CAPTION>
                                                Six Months Ended June 30,
                                           -----------------------------------
                                                                    Pro Forma
                                              1999        2000        2000
                                           ----------- ----------- -----------
                                           (unaudited) (unaudited) (unaudited)
<S>                                        <C>         <C>         <C>
Operations Statement Data:
Revenue...................................  $ 403,771   $ 620,082   $ 769,055
Operating expenses:
 Cost of service..........................    205,507     344,426     466,226
 Selling, general and administrative......    178,339     256,563     309,973
 Depreciation and amortization............     78,708     163,193     213,415
 Other....................................        --          --          872
                                            ---------   ---------   ---------
 Total operating expenses.................    462,554     764,182     990,486
Operating loss............................    (58,783)   (144,100)   (221,431)
Interest income (expense), net............    (50,666)    (42,077)    (70,486)
Other income..............................        562       1,971       1,996
Income taxes..............................        --          --          --
                                            ---------   ---------   ---------
Net loss..................................   (108,887)   (184,206)   (289,921)
Preferred stock dividends.................        --      (27,204)    (27,204)
                                            ---------   ---------   ---------
Loss applicable to common stock...........  $(108,887)  $(211,410)  $(317,125)
                                            =========   =========   =========
Loss per common share.....................  $    (.26)  $    (.40)  $    (.54)
                                            =========   =========   =========
Weighted average common shares
 outstanding..............................    423,210     529,109     590,221
                                            =========   =========   =========
</TABLE>

                                       64
<PAGE>

               Selected Consolidated Financial Data of McLeodUSA
                     (In thousands, except per share data)

<TABLE>
<CAPTION>
                                           December 31,                          June 30, 2000
                         -------------------------------------------------- -----------------------
                          1995      1996      1997       1998       1999      Actual     Pro Forma
                         -------  -------- ---------- ---------- ---------- ----------- -----------
                                                                            (unaudited) (unaudited)
<S>                      <C>      <C>      <C>        <C>        <C>        <C>         <C>
Balance Sheet Data:
Current assets.......... $ 8,507  $224,401 $  517,869 $  793,192 $1,569,473 $1,647,070  $1,879,002
Working capital
 (deficit).............. $(1,208) $185,968 $  378,617 $  613,236 $1,272,794 $  859,997  $  913,955
Property and equipment,
 net.................... $16,119  $ 92,123 $  373,804 $  629,746 $1,270,032 $1,897,962  $2,321,001
Total assets............ $28,986  $452,994 $1,345,652 $1,925,197 $4,203,147 $7,069,543  $7,791,496
Long-term debt.......... $ 3,600  $  2,573 $  613,384 $1,245,170 $1,763,725 $2,370,370  $2,718,588
Redeemable convertible
 preferred stock........ $   --   $    --  $      --  $      --  $1,000,000 $1,000,000  $1,000,000
Stockholders' equity.... $14,958  $403,429 $  559,379 $  462,806 $1,108,542 $2,878,436  $3,074,207
</TABLE>

<TABLE>
<CAPTION>
                                         Year Ended December 31,
                         ----------------------------------------------------------
                                                                         Pro Forma
                          1995      1996      1997      1998     1999      1999
                         -------  --------  --------  -------- -------- -----------
                                                                        (unaudited)
<S>                      <C>      <C>       <C>       <C>      <C>      <C>
Other Financial Data:
Capital expenditures
Property, plant and
 equipment.............. $ 6,364  $ 79,845  $179,255  $289,923 $580,003 $  820,756
Business acquisitions... $ 8,333  $ 93,937  $421,882  $ 49,737 $736,626 $3,376,180
EBITDA(1)............... $(8,723) $(17,345) $(31,462) $ 20,007 $ 59,020 $   29,778
</TABLE>

<TABLE>
<CAPTION>
                                                 Six Months Ended June 30,
                                            -----------------------------------
                                                                     Pro Forma
                                               1999        2000        2000
                                            ----------- ----------- -----------
                                            (unaudited) (unaudited) (unaudited)
<S>                                         <C>         <C>         <C>
Other Financial Data:
Capital expenditures
Property, plant and equipment..............  $220,390   $  559,834  $  804,163
Business acquisitions......................  $525,161   $2,052,925  $2,415,523
EBITDA(1)..................................  $ 19,925   $   19,093  $   (7,144)
</TABLE>
--------
(1) EBITDA consists of operating loss before depreciation, amortization and
    other nonrecurring operating expenses. McLeodUSA has included EBITDA data
    because it is a measure commonly used in the industry. EBITDA is not a
    measure of financial performance under generally accepted accounting
    principles and should not be considered an alternative to net income as a
    measure of performance or to cash flows as a measure of liquidity.

                                       65
<PAGE>

                            PRO FORMA FINANCIAL DATA

   The following unaudited pro forma financial information has been prepared to
give effect to:

  .  the issuance of the 8 1/8% senior notes in February 1999

  .  the acquisition of Ovation Communications, Inc. in March 1999

  .  the issuance of the 6.75% Series A preferred stock in August 1999

  .  the issuance of the Series B preferred stock and Series C preferred
     stock in September 1999

  .  the acquisition of Splitrock Services, Inc. in March 2000

  .  the completion of the Senior Secured Credit Facilities in May 2000

  .  the merger

   For purposes of this pro forma presentation, the issuance of the 8 1/8%
senior notes is referred to as the "Notes Offering" and the issuance of the
Series A, Series B and Series C preferred stock are collectively referred to as
the "Preferred Stock Issuances." The Unaudited Pro Forma Condensed Consolidated
Balance Sheet assumes that the merger was consummated on June 30, 2000.

   The Unaudited Pro Forma Condensed Consolidated Statements of Operations
include the operations of Ovation Communications, Inc., the operations of
Splitrock Services, Inc., and the operations of CapRock as if the acquisition
of Ovation and Splitrock and the merger with CapRock were consummated on
January 1, 1999 and the related weighted average share amounts have been
adjusted to give effect to the shares issued in the transactions as if they had
been issued on January 1, 1999. The CapRock results have been adjusted to give
effect to the issuance in May 1999 by CapRock of $210 million of its 11 1/2%
senior notes due 2009 as if the issuance was consummated on January 1, 1999. It
also assumes that interest related to the Notes Offering and the Senior Secured
Credit Facilities, dividends related to the Preferred Stock Issuances and the
additional depreciation and amortization due to the increased value of tangible
and intangible assets acquired through the acquisition of Ovation, Splitrock
and the merger with CapRock, using the purchase method of accounting, began
January 1, 1999. The unaudited pro forma financial information is derived from
and should be read in conjunction with the Consolidated Financial Statements of
McLeodUSA and the related notes thereto included in the McLeodUSA Annual Report
on Form 10-K for the fiscal year ended December 31, 1999. The pro forma
adjustments for the acquisitions of Ovation and Splitrock, the Notes Offering
and the Preferred Stock Issuances are incorporated by reference from a Current
Report on Form 8-K/A filed with the SEC on June 13, 2000.

   For purposes of allocating the net purchase price among the various assets
to be acquired, McLeodUSA has preliminarily considered the carrying value of
the acquired assets to approximate their fair value, with all of the excess of
the net purchase price being attributed to intangible assets, primarily
goodwill. McLeodUSA intends to more fully evaluate the acquired assets
following consummation of the merger and, as a result, the allocation of the
net purchase price among the acquired tangible and intangible assets may
change.

   The unaudited pro forma financial information is provided for informational
purposes only and is not necessarily indicative of the operating results that
would have occurred had the merger been consummated at the beginning of 1999,
nor is it necessarily indicative of future operating results or financial
position.

                                                 (table begins on the next page)

                                       66
<PAGE>

                    McLeodUSA Incorporated and Subsidiaries

           Unaudited Pro Forma Condensed Consolidated Balance Sheets
             (In thousands, except share and per share information)
                              As of June 30, 2000

<TABLE>
<CAPTION>
                                                  Adjustments for  Pro Forma for
                                                      CapRock         CapRock
                            McLeodUSA   CapRock     Transaction     Transaction
                            ----------  --------  ---------------  -------------
<S>                         <C>         <C>       <C>              <C>
ASSETS
Current Assets:
  Cash and cash
   equivalents............. $  931,318  $  3,680     $    --        $  934,998
  Other current assets.....    715,752   245,596      (17,344)(2)      944,004
                            ----------  --------     --------       ----------
    Total Current Assets...  1,647,070   249,276      (17,344)       1,879,002
  Property and Equipment,
   net.....................  1,897,962   423,039          --         2,321,001
  Intangible assets........  3,373,029       --        63,123(1)     3,436,152
  Other assets.............    151,482     3,859          --           155,341
                            ----------  --------     --------       ----------
    Total Assets........... $7,069,543  $676,174     $ 45,779       $7,791,496
                            ==========  ========     ========       ==========
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities........ $  787,083  $144,964     $ 33,000(3)    $  965,047
  Long-term debt, less
   current maturities......  2,370,370   348,218          --         2,718,588
  Other long-term
   liabilities.............     33,654     5,254       (5,254)(2)       33,654
                            ----------  --------     --------       ----------
    Total Liabilities......  3,191,107   498,436       27,746        3,717,289
                            ----------  --------     --------       ----------
Redeemable convertible
 preferred stock...........  1,000,000       --           --         1,000,000
                            ----------  --------     --------       ----------
Stockholders' Equity:
  Preferred stock..........         12       --           --                12
  Common stock.............      5,817       387         (237)           5,967
  Additional paid-in
   capital.................  3,497,346   191,808        3,813        3,692,967
  Treasury Stock, at cost..        --       (678)         678              --
  Retained earnings
   (deficit)...............   (706,669)  (13,570)      13,570         (706,669)
  Accumulated other
   comprehensive income....     81,930      (209)         209           81,930
                            ----------  --------     --------       ----------
    Total Stockholders'
     Equity................  2,878,436   177,738       18,033        3,074,207
                            ----------  --------     --------       ----------
    Total Liabilities and
     Stockholders' Equity.. $7,069,543  $676,174     $ 45,779       $7,791,496
                            ==========  ========     ========       ==========
</TABLE>
--------
(1) The adjustment for the merger reflects the preliminary allocation of the
    net purchase price of CapRock to the net assets of CapRock that are to be
    acquired, including intangible assets, and record the issuance of
    15,023,318 shares of McLeodUSA Class A common stock valued at $13.77 per
    share. The value of $13.77 per share represents the average closing price
    of McLeodUSA Class A common stock on the Nasdaq National Market for the 10
    trading days beginning five days prior to the date the merger agreement was
    announced, October 2, 2000, and ending four days after such announcement.
    The net purchase price of approximately $579 million is equal to (1) the
    product of (A) the total number of shares of CapRock common stock
    attributable to outstanding CapRock common stock and options with exercise
    prices below the closing price of $5.063 (totaling 39,001,954) as of
    October 2, 2000, multiplied by (B) the conversion ratio of 0.3876,
    multiplied by (C) $13.77, the value of a share of McLeodUSA Class A common
    stock (calculated as described above), minus (2) the aggregate option
    proceeds to be received (approximately $0.3 million) plus (3) the principal
    amount of outstanding CapRock senior notes ($360 million) and the estimated
    liabilities directly attributable to the merger ($11 million). The
    allocation of the net purchase price to the net assets, excluding debt,
    (approximately $516 million) and debt ($360 million) of CapRock as of June
    30, 2000, results in goodwill of approximately $63 million.

                                       67
<PAGE>

(2) To eliminate CapRock's deferred tax assets and deferred tax liabilities.
    McLeodUSA expects to continue to be in a net deferred tax asset position
    after the merger and will continue to provide a valuation allowance on the
    net deferred tax assets.
(3) Reflects an increase in current liabilities related to banking, legal and
    accounting fees, write-off of debt issuance costs and unaccreted discount
    on CapRock's senior notes and other matters directly attributable to the
    merger under EITF 95-3.

                                       68
<PAGE>

                    McLeodUSA Incorporated and Subsidiaries

      Unaudited Pro Forma Condensed Consolidated Statements of Operations
                  (In thousands, except per share information)

<TABLE>
<CAPTION>
                                           Twelve Months Ended December 31, 1999
                          ------------------------------------------------------------------------------
                          Pro Forma for  Adjustment    Pro Forma               Adjustments
                            Splitrock    for Credit    for Credit  CapRock As  for CapRock    Pro Forma
                          Acquisition(2) Facilities    Facilities  Adjusted(4) Acquisition   for CapRock
                          -------------- ----------    ----------  ----------- -----------   -----------
<S>                       <C>            <C>           <C>         <C>         <C>           <C>
Operations Statement
 Data:
 Revenue................    $1,018,044    $    --      $1,018,044   $192,623     $   --      $1,210,667
                            ----------    --------     ----------   --------     -------     ----------
 Operating expenses:
 Cost of service........       583,725         --         583,725    115,676         --         699,401
 Selling, general and
  administrative........       424,953         --         424,953     56,535         --         481,488
 Depreciation and
  amortization..........       333,277         --         333,277      9,698       3,156(5)     346,131
 Other..................           --          --             --         --          --             --
                            ----------    --------     ----------   --------     -------     ----------
  Total operating
   expenses.............     1,341,955         --       1,341,955    181,909       3,156      1,527,020
                            ----------    --------     ----------   --------     -------     ----------
 Operating income
  (loss)................      (323,911)        --        (323,911)    10,714      (3,156)      (316,353)
 Interest income
  (expense), net........      (127,456)    (36,493)(3)   (163,949)   (27,119)        --        (191,068)
 Other nonoperating
  income (expense)......         5,637         --           5,637      1,526         --           7,163
 Income taxes...........           --          --             --      (5,505)     (5,505)(6)        --
                            ----------    --------     ----------   --------     -------     ----------
 Net income (loss)......      (445,730)    (36,493)      (482,223)    (9,374)     (8,661)      (500,258)
 Preferred stock
  dividends.............       (54,375)        --         (54,375)       --          --         (54,375)
                            ----------    --------     ----------   --------     -------     ----------
 Earnings applicable to
  common stock..........    $ (500,105)   $(36,493)    $ (536,598)  $ (9,374)    $(8,661)    $ (554,633)
                            ==========    ========     ==========   ========     =======     ==========
 Loss per common and
  common equivalent
  share.................    $    (0.92)                $    (0.99)                           $    (0.99)
                            ==========                 ==========                            ==========
 Weighted average common
  and common equivalent
  shares outstanding....       544,728                    544,728                 15,023        559,751
                            ==========                 ==========                =======     ==========
Other Financial Data:
 EBITDA(1)..............    $    9,366    $    --      $    9,366   $ 20,412     $   --      $   29,778
</TABLE>
--------
(1) EBITDA consists of operating loss before depreciation, amortization and
    other nonrecurring operating expenses. McLeodUSA has included EBITDA data
    because it is a measure commonly used in the industry. EBITDA is not a
    measure of financial performance under generally accepted accounting
    principles and should not be considered an alternative to net income as a
    measure of performance or to cash flows as a measure of liquidity.
(2) The "Pro Forma for Splitrock Acquisition" information is derived from the
    Pro Forma Financial Statements that were filed by McLeodUSA with the SEC on
    a Current Report on Form 8-K/A on June 13, 2000.
(3) McLeodUSA used cash on hand and funds drawn from the Senior Secured Credit
    Facilities to retire the outstanding Splitrock 11 3/4% senior notes in July
    2000. This adjustment records the pro forma annual interest expense of
    approximately $66 million on the Senior Secured Credit Facilities, reduced
    by the interest expense on the Splitrock 11 3/4% senior notes as previously
    reported in the "Pro Forma for Splitrock Acquisition."
(4) As adjusted financial information gives effect to the issuance by CapRock
    of $210 million of its 11 1/2% senior notes due 2009 in May 1999 as if such
    issuance had occurred on January 1, 1999. See "CapRock Communications
    Corp.--Unaudited Pro Forma Condensed Statement of Operations."
(5) To amortize intangibles acquired in the merger over 20 years.
(6) To eliminate CapRock's income tax benefit.

                                       69
<PAGE>

                    McLeodUSA Incorporated and Subsidiaries

      Unaudited Pro Forma Condensed Consolidated Statements of Operations
                  (In thousands, except per share information)

<TABLE>
<CAPTION>
                                                          Six Months Ended June 30, 2000
                    -------------------------------------------------------------------------------------------------------
                                             Adjustments     Pro Forma   Adjustments    Pro Forma             Adjustments
                                            for Splitrock  for Splitrock for Credit     for Credit            for CapRock
                    McLeodUSA  Splitrock(2) Acquisition(2)  Acquisition  Facilities     Facilities  CapRock   Acquisition
                    ---------  ------------ -------------- ------------- -----------    ----------  --------  -----------
<S>                 <C>        <C>          <C>            <C>           <C>            <C>         <C>       <C>
Operations
 Statement Data:
 Revenue..........  $ 620,082    $ 35,037     $     --       $ 655,119    $    --       $ 655,119   $113,936   $    --
                    ---------    --------     ---------      ---------    --------      ---------   --------   --------
 Operating
  expenses:
 Cost of service..    344,426      42,580           --         387,006         --         387,006     79,220
 Selling, general
  and
  administrative..    256,563      10,012           --         266,575         --         266,575     43,398
 Depreciation and
  amortization....    163,193      12,470        27,097        202,760         --         202,760      9,077      1,578(4)
 Other............        --          872           --             872         --             872        --
                    ---------    --------     ---------      ---------    --------      ---------   --------   --------
  Total operating
   expenses.......    764,182      65,934        27,097        857,213         --         857,213    131,695      1,578
                    ---------    --------     ---------      ---------    --------      ---------   --------   --------
 Operating income
  (loss)..........   (144,100)    (30,897)      (27,097)      (202,094)        --        (202,094)   (17,759)    (1,578)
 Interest income
  (expense), net..    (42,077)     (6,302)          --         (48,379)    (15,086)(3)    (63,465)    (7,021)       --
 Other
  nonoperating
  income
  (expense).......      1,971         --            --           1,971         --           1,971         25        --
 Income taxes.....        --          --            --             --          --             --       9,118     (9,118)(5)
                    ---------    --------     ---------      ---------    --------      ---------   --------   --------
 Net income
  (loss)..........   (184,206)    (37,199)      (27,097)      (248,502)    (15,086)      (263,588)   (15,637)   (10,696)
 Preferred stock
  dividends.......    (27,204)        --            --         (27,204)        --         (27,204)       --         --
                    ---------    --------     ---------      ---------    --------      ---------   --------   --------
 Earnings
  applicable to
  common stock....  $(211,410)   $(37,199)    $ (27,097)     $(275,706)   $(15,086)     $(290,792)  $(15,637)  $(10,696)
                    =========    ========     =========      =========    ========      =========   ========   ========
 Loss per common
  and common
  equivalent
  share...........  $   (0.40)                               $   (0.48)                 $   (0.51)
                    =========                                =========                  =========
 Weighted average
  common and
  common
  equivalent
  shares
  outstanding.....    529,109                    46,089        575,198                    575,198                15,023
                    =========                 =========      =========                  =========              ========
Other Financial
 Data:
 EBITDA(1)........  $  19,093    $(17,555)    $     --       $   1,538    $    --       $   1,538   $ (8,682)  $    --
<CAPTION>
                     Pro Forma
                    for CapRock
                    Acquisition
                    -----------
<S>                 <C>
Operations
 Statement Data:
 Revenue..........   $ 769,055
                    -----------
 Operating
  expenses:
 Cost of service..     466,226
 Selling, general
  and
  administrative..     309,973
 Depreciation and
  amortization....     213,415
 Other............         872
                    -----------
  Total operating
   expenses.......     990,486
                    -----------
 Operating income
  (loss)..........    (221,431)
 Interest income
  (expense), net..     (70,486)
 Other
  nonoperating
  income
  (expense).......       1,996
 Income taxes.....         --
                    -----------
 Net income
  (loss)..........    (289,921)
 Preferred stock
  dividends.......     (27,204)
                    -----------
 Earnings
  applicable to
  common stock....   $(317,125)
                    ===========
 Loss per common
  and common
  equivalent
  share...........   $   (0.54)
                    ===========
 Weighted average
  common and
  common
  equivalent
  shares
  outstanding.....     590,221
                    ===========
Other Financial
 Data:
 EBITDA(1)........   $  (7,144)
</TABLE>
-------
(1) EBITDA consists of operating loss before depreciation, amortization and
    other nonrecurring operating expenses. McLeodUSA has included EBITDA data
    because it is a measure commonly used in the industry. EBITDA is not a
    measure of financial performance under generally accepted accounting
    principles and should not be considered an alternative to net income as a
    measure of performance or to cash flows as a measure of liquidity.
(2) The "Splitrock" column represents Splitrock's Statement of Operations for
    the period of January 1, 2000 through March 30, 2000, the date of the
    acquisition of Splitrock by McLeodUSA. The Splitrock financial statements
    and the information in the "Adjustments for Splitrock Acquisition" column
    are from the Pro Forma Financial Statements that were filed by McLeodUSA
    with the SEC on a Current Report on Form 8-K/A on June 13, 2000.
(3) McLeodUSA used cash on hand and funds drawn from the Senior Secured Credit
    Facilities to retire the outstanding Splitrock 11 3/4% senior notes in July
    2000. This adjustment records the pro forma interest expense on the Senior
    Secured Credit Facilities reduced by the interest expense on the Splitrock
    11 3/4% senior notes as previously reported in the "Pro Forma for Splitrock
    Acquisition."
(4) To amortize intangibles acquired in the merger over 20 years.
(5) To eliminate CapRock's income tax benefit.

                                       70
<PAGE>

                          CapRock Communications Corp.

             Unaudited Pro Forma Condensed Statements of Operations
                  (In thousands, except per share information)

   The following unaudited pro forma financial information has been prepared to
give effect to the issuance by CapRock of $210 million of its 11 1/2% senior
notes due 2009 in May 1999 as if such issuance had occurred on January 1, 1999.
The unaudited pro forma financial information is derived from and should be
read in conjunction with the financial statements of CapRock and the related
notes thereto included in the CapRock Annual Report on Form 10-K for the fiscal
year ended December 31, 1999, which is incorporated by reference into this
proxy statement/prospectus. The pro forma adjustments are based upon available
information and assumptions that management believes to be reasonable.

<TABLE>
<CAPTION>
                                         Twelve Months Ended December 31, 1999
                                         --------------------------------------
                                                                    Pro Forma
                                                   Adjustments for for May 1999
                                         CapRock   May 1999 Notes     Notes
                                         --------  --------------- ------------
<S>                                      <C>       <C>             <C>
Operations Statement Data:
 Revenue................................ $192,623      $   --        $192,623
                                         --------      -------       --------
 Operating expenses:
  Cost of service.......................  115,676          --         115,676
  Selling, general and administrative...   56,535          --          56,535
  Depreciation and amortization.........    9,698          --           9,698
  Other.................................      --           --             --
                                         --------      -------       --------
    Total operating expenses............  181,909          --         181,909
  Operating income (loss)...............   10,714          --          10,714
  Interest income (expense), net........  (17,861)      (9,258)       (27,119)
  Other nonoperating income (expense)...    1,526          --           1,526
  Income tax benefit (expense)..........    2,080        3,425          5,505
                                         --------      -------       --------
  Net income (loss).....................   (3,541)      (5,833)        (9,374)
  Preferred stock dividends.............      --           --             --
                                         --------      -------       --------
  Earnings applicable to common stock... $ (3,541)     $(5,833)      $ (9,374)
                                         ========      =======       ========
  Loss per common and common equivalent
   share................................ $  (0.11)                   $  (0.30)
                                         ========                    ========
  Weighted average common and common
   equivalent shares outstanding........   31,727                      31,727
                                         ========                    ========
</TABLE>

                                       71
<PAGE>

                           INFORMATION ABOUT CAPROCK

Overview

   CapRock. CapRock is a facilities-based integrated communications service
provider primarily to small and medium-sized business and communications
carrier customers in the Southwestern United States. CapRock offers business
customers an integrated bundle of communications products and services
including local exchange, domestic and international long distance, enhanced
voice, data, Internet, DSL and dedicated private line services. Additionally,
CapRock offers its communications-intensive business and carrier customers dark
fiber, high bandwidth dedicated fiber infrastructure, terminating access for
domestic and international long distance and ATM, frame relay and IP data
transport services.

   CapRock's communications services are provided through resale and over its
fiber, voice and data networks. As of June 30, 2000, CapRock's network covered
approximately 4,500 route miles (including 22 metro fiber loops in key
markets). Additionally, as of June 30, 2000, CapRock provided switch-based
competitive local exchange services in 13 markets. As of June 30, 2000, CapRock
had 12 voice and 17 data switches installed and operational on its network.

   CapRock had 61 central office collocations as of June 30, 2000. CapRock is
implementing its DSL footprint through its recent agreement with a third party
supplier of DSL services. These collocations enable CapRock to provide local
and other services over its own network infrastructure, thereby lowering its
cost of providing these services.

   CapRock's Network. CapRock's fiber network is comprised primarily of 96
fiber strands pulled through one of four conduits buried below ground. A key
element of CapRock's strategy is to reduce the cost basis of fiber it retains
for its own use by sharing construction costs with other carriers and to
quickly recover its investment by selling excess dark fiber. CapRock plans to
retain at least 24 fiber strands throughout its entire network. CapRock is also
building a competitive local exchange service in 48 markets where it will
provide Class 5 switching functionality and DSL services to its local
customers. CapRock's data network will consist of data switches and fiber
capacity that will connect all of these markets, supporting ATM, frame relay
and IP traffic. In many of these local markets CapRock will install equipment
to backhaul its voice and data traffic to one of its switches in order to
significantly lower its capital requirements.

   Information Technology Systems and Electronic Bonding. CapRock is automating
most of the processes involved with switching a customer to its network in
order to decrease the time between receipt of a customer order and completion
of service installation. To achieve this goal, CapRock is acquiring,
integrating and developing information technology systems and platforms to
support its operations. CapRock has established and will continue to implement
"electronic bonding," which is the on-line and real-time connection of its
operating systems with those of ILECs. Additionally, CapRock has developed and
intends to roll out web-enabled ordering, billing and customer service features
to its customers.

   CapRock has completed testing and began utilizing electronic bonding with
Southwestern Bell Telephone. Electronic bonding with Southwestern Bell has
enabled CapRock to reduce its provisioning times from approximately 25 business
days to as few as five business days. Orders submitted with electronic bonding
are also less likely to be rejected by Southwestern Bell, resulting in a
greater percentage of customers being transitioned to CapRock's facilities in a
shorter amount of time.

   Joint Build Projects. CapRock has entered into joint fiber construction
agreements with AT&T, Enron Broadband Services, Inc., Pathnet, Inc. and
360networks, Inc. The joint construction arrangements provide several benefits,
including reduction of construction costs, accelerated construction, and the
freeing up of resources to focus attention on the construction of additional
portions of CapRock's network. To further recover the cost of building its
fiber network, CapRock has sold and intends to continue to sell excess dark
fiber.


                                       72
<PAGE>

   Sales Organization. CapRock uses a direct sales force to sell its
communications products and services to business customers. CapRock believes
that its face-to-face sales efforts coupled with its personalized customer care
are highly effective in capturing and retaining market share among small and
medium-sized businesses. CapRock had 251 sales force employees as of June 30,
2000. CapRock provides its sales force with financial incentives that promote a
high level of ongoing customer care and loyalty.

   Additionally, as of June 30, 2000, CapRock had 267 independent sales agents
who contributed to its sales efforts throughout the region, primarily in
smaller markets. CapRock's agent program was established in 1996, and consists
primarily of independent telephone equipment vendors authorized by CapRock to
market its products and services. Authorized agents receive recurring
commissions based on product, pricing, volume of usage and customer loyalty.
CapRock has six agent managers who actively recruit new independent sales
agents.

   Litigation. On July 26, 2000, a class action complaint was filed in the
United States District Court for the Northern District of Texas on behalf of
all purchasers of CapRock common stock during the period between April 28, 2000
and July 6, 2000. Additional stockholder suits have been filed subsequently,
also in the United States District Court for the Northern District of Texas.
The named defendants in these lawsuits, which allege that CapRock made material
misstatements or omissions of fact in violation of Section 10(b) of the
Securities Exchange Act, include CapRock and certain of its officers and
directors. The plaintiffs in the lawsuits seek monetary damages. CapRock
believes that the lawsuits are without merit and intends to vigorously defend
the pending suits and any other similar suits subsequently filed.

   On October 6, 2000, a class action complaint was filed in the County Court
at Law of Dallas County, Texas on behalf of CapRock's stockholders. This
complaint names as defendants CapRock and each member of its board of directors
and principally alleges that the directors violated fiduciary duties owed to
CapRock's stockholders in connection with entering into the merger agreement.
The plaintiffs in the lawsuit seek both unspecified monetary damages and an
injunction to prevent completion of the merger. CapRock believes that the
lawsuit is without merit and intends to vigorously defend the lawsuit.

                               ----------------

   CapRock is a Texas corporation that was formed on February 3, 1998 to be a
holding company for its predecessor companies. The principal executive offices
of CapRock are located at 15601 Dallas Parkway, Suite 700, Dallas, Texas 75001,
and its phone number is (972) 982-9550.

Additional Information

   A detailed description of the CapRock business, executive compensation,
various benefit plans, including stock option plans, voting securities and the
principal holders of these securities, relationships and transactions between
CapRock and its executive officers, directors and principal stockholders,
financial statements and other matters related to CapRock is incorporated by
reference or set forth in the CapRock Annual Report on Form 10-K for the year
ended December 31, 1999 and the CapRock Quarterly Reports on Form 10-Q for the
quarters ended March 31, 2000 and June 30, 2000, incorporated by reference into
this proxy statement/prospectus. Stockholders desiring copies of such documents
may contact CapRock at its address or telephone number indicated under "Where
You Can Find More Information."

                                       73
<PAGE>

                SELECTED CONSOLIDATED FINANCIAL DATA OF CAPROCK

   The following table sets forth financial data as of and for the years ended
December 31, 1995, 1996, 1997, 1998 and 1999 and as of and for the six months
ended June 30, 1999 and 2000. The business combination among CapRock's
predecessor companies was completed on August 26, 1998 and was accounted for as
a pooling of interests. Accordingly, these Consolidated Financial Statements
include CapRock's three predecessor companies (CapRock Telecommunications
Corp., CapRock Fiber Network, LTD. and IWL Communications, Incorporated) as
though these entities were always a part of CapRock.

   In May 1998, IWL Communications changed its fiscal year end to coincide with
the fiscal years of CapRock, CapRock Telecommunications and CapRock Fiber. The
Consolidated Statement of Operations for the year ended December 31, 1996
combines the operating activity of IWL Communications for the year ended June
30, 1996 with the operating activity of CapRock Telecommunications and CapRock
Fiber for the year ended December 31, 1996. The net income of IWL
Communications in the amount of approximately $260,000 for the six month period
ended December 31, 1996 was excluded from the Consolidated Statement of
Operations for the year ended December 31, 1996 as a result of the non-
conforming year ends for such period. This amount was included as an adjustment
to retained earnings in the Consolidated Statement of Stockholders' Equity and
Comprehensive Income in 1997. IWL Communications' cash flow for this period was
added to the 1997 beginning balance in the Consolidated Statement of Cash
Flows.

<TABLE>
<CAPTION>
                                 As of and for the Year Ended December 31,
                                 ---------------------------------------------
                                  1995     1996     1997      1998      1999
                                 -------  -------  -------  --------  --------
                                   (in thousands, except per share data)
<S>                              <C>      <C>      <C>      <C>       <C>
Statement of Operations Data:
  Revenues...................... $29,407  $50,970  $75,349  $121,774  $192,623
  Costs of Services.............  21,185   39,357   52,471    83,221   115,676
                                 -------  -------  -------  --------  --------
    Gross profit................   8,222   11,613   22,878    38,553    76,947
  Operating expenses:
    Selling, general and
     administrative.............   7,326    8,983   14,074    23,528    56,535
    Merger related expenses.....     --       --       --      2,313       --
    Depreciation and
     amortization...............   1,186    1,536    3,346     4,887     9,698
                                 -------  -------  -------  --------  --------
      Total operating expenses..   8,512   10,519   17,420    30,728    66,233
                                 -------  -------  -------  --------  --------
  Operating income (loss).......    (290)   1,094    5,458     7,825    10,714
  Interest expense, net.........    (484)    (585)  (1,603)   (6,441)  (17,861)
  Other income (expense)........     151       42      220       106     1,526
                                 -------  -------  -------  --------  --------
  Income (loss) before income
   taxes and extraordinary
   item.........................    (623)     551    4,075     1,490    (5,621)
  Income tax expense (benefit)..      48      227    1,513     1,267    (2,080)
                                 -------  -------  -------  --------  --------
  Income (loss) before
   extraordinary item...........    (671)     324    2,562       223    (3,541)
  Extraordinary item--
   extinguishment of debt.......     645      --       --        --        --
                                 -------  -------  -------  --------  --------
  Net income (loss)............. $   (26) $   324  $ 2,562  $    223  $ (3,541)
                                 =======  =======  =======  ========  ========
  Pro forma net income (loss):
    Income (loss) before income
     taxes and extraordinary
     item....................... $  (623) $   551  $ 4,075  $  1,490  $ (5,621)
    Pro forma income taxes, as
     if CapRock Fiber were a C
     corporation................    (211)     143    1,475     1,267    (2,080)
                                 -------  -------  -------  --------  --------
    Income (loss) before
     extraordinary item.........    (412)     408    2,600       223    (3,541)
    Extraordinary item, net of
     taxes......................     397      --       --        --        --
                                 -------  -------  -------  --------  --------
      Pro forma net income
       (loss)................... $   (15) $   408  $ 2,600  $    223  $ (3,541)
                                 =======  =======  =======  ========  ========
  Historical and pro forma
   income (loss) per common
   share:
    Income (loss) before
     extraordinary item......... $ (0.02) $  0.01  $  0.09  $   0.01  $  (0.11)
    Extraordinary item, net of
     tax........................ $  0.02      --       --        --        --
                                 -------  -------  -------  --------  --------
    Basic and diluted........... $   --   $  0.01  $  0.09  $   0.01  $  (0.11)
                                 =======  =======  =======  ========  ========
  Weighted average shares
   outstanding:
    Basic.......................  25,926   27,146   27,984    28,899    31,727
    Diluted.....................  25,936   27,156   28,481    30,028    31,727
</TABLE>

                                       74
<PAGE>

                Selected Consolidated Financial Data of CapRock
                     (In thousands, except per share data)

<TABLE>
<CAPTION>
                                                            Six Months Ended
                                                                June 30,
                                                           -------------------
                                                             1999      2000
                                                           --------  ---------
<S>                                                        <C>       <C>
Statement of Operations Data:
  Revenues................................................  $74,596   $113,936
  Costs of Services.......................................   44,919     79,220
                                                           --------  ---------
    Gross profit..........................................   29,677     34,716
  Operating expenses:
    Selling, general and administrative...................   25,012     43,398
    Merger related expenses...............................      --         --
    Depreciation and amortization.........................    3,337      9,077
                                                           --------  ---------
      Total operating expenses............................   28,349     52,475
                                                           --------  ---------
  Operating income (loss).................................    1,328    (17,759)
  Interest expense, net...................................   (7,134)    (7,021)
  Other income (expense)..................................     (135)        25
                                                           --------  ---------
  Income (loss) before income taxes and extraordinary
   item...................................................   (5,941)   (24,755)
  Income tax expense (benefit)............................   (2,335)    (9,118)
                                                           --------  ---------
  Income (loss) before extraordinary item.................   (3,606)   (15,637)
  Extraordinary item--extinguishment of debt..............      --         --
                                                           --------  ---------
  Net income (loss)....................................... $  3,606  $ (15,637)
                                                           ========  =========
  Pro forma net income (loss):
    Income (loss) before income taxes and extraordinary
     item................................................. $ (5,941) $ (24,755)
    Pro forma income taxes, as if CapRock Fiber were a C
     corporation..........................................   (2,335)    (9,118)
                                                           --------  ---------
    Income (loss) before extraordinary item...............   (3,606)   (15,637)
    Extraordinary item, net of taxes......................      --         --
                                                           --------  ---------
      Pro forma net income (loss)......................... $ (3,606) $ (15,637)
                                                           ========  =========
  Historical and pro forma income (loss) per common share:
    Income (loss) before extraordinary item............... $  (0.12) $   (0.47)
    Extraordinary item, net of tax........................      --         --
  Basic and diluted....................................... $  (0.12) $   (0.47)
                                                           ========  =========
  Weighted average shares outstanding:
    Basic.................................................   30,321     33,406
    Diluted...............................................   30,321     33,406
</TABLE>

                                       75
<PAGE>

                Selected Consolidated Financial Data of CapRock

                     (In thousands, except per share data)

<TABLE>
<CAPTION>
                                                                             Six Months Ended
                           As of and for the Year Ended December 31,             June 30,
                         -------------------------------------------------  --------------------
                          1995      1996      1997      1998       1999       1999       2000
                         -------  --------  --------  ---------  ---------  ---------  ---------
<S>                      <C>      <C>       <C>       <C>        <C>        <C>        <C>
Balance Sheet Data:
 Working capital
  (deficit)............. $  (797) $ (2,153) $   (305) $ 102,489  $ 216,145  $ 337,555  $ 104,312
 Property, plant and
  equipment, net........   6,705    15,901    27,341     59,607    228,601     97,360    423,039
 Total assets...........  13,198    28,522    49,389    191,966    548,835    479,533    676,174
 Long-term debt and
  capital lease
  obligations...........   2,443    13,254    21,062    145,187    347,502    347,012    348,218
 Stockholders' equity...   3,552     3,886    14,086     16,062     96,030     94,939    177,738
Operating Data:
 EBITDA(1).............. $   896  $  2,630  $  8,804  $  15,025  $  20,412  $  (4,665) $  (8,682)
 Cash flows provided by
  (used in) operations..     827       781     4,112      7,125    (13,302)   (14,897)    50,799
 Cash flows used in
  investing activities..  (1,919)   (9,350)  (12,987)  (134,350)  (264,623)  (258,169)  (159,910)
 Cash flows provided by
  financing activities..     903     8,605    12,114    123,990    283,338    283,872    107,113
 Capital expenditures...  (2,282)  (10,212)  (13,631)   (36,855)  (201,289)   (45,717)  (216,263)
</TABLE>
--------
(1) EBITDA consists of operating income or loss before interest, income taxes,
    depreciation and amortization and other nonrecurring operating expenses.
    EBITDA is a measure commonly used in the communications industry. EBITDA is
    not a measure of financial performance under generally accepted accounting
    principles and should not be considered as an alternative to net income as
    a measure of performance nor as an alternative to cash flow as a measure of
    liquidity.

                                       76
<PAGE>

          McLEODUSA CAPITAL STOCK AND COMPARISON OF STOCKHOLDER RIGHTS

   If the merger is completed, shares of CapRock common stock will be converted
into shares of McLeodUSA Class A common stock. As a result, CapRock
stockholders, whose rights are currently governed by the Texas Business
Corporation Act, the CapRock articles of incorporation and bylaws, will become
McLeodUSA stockholders, whose rights are governed by the Delaware General
Corporation Law, the McLeodUSA certificate of incorporation and bylaws.

   The following is a description of the capital stock of McLeodUSA, including
the McLeodUSA Class A common stock to be issued in the merger, and a summary of
the material differences between the rights of CapRock stockholders and
McLeodUSA stockholders. These differences arise from the differences between
the Texas Business Corporation Act and the Delaware General Corporation Law, as
well as the CapRock articles of incorporation and bylaws and the McLeodUSA
certificate of incorporation and bylaws. Although it is impractical to compare
all of the aspects in which the state corporate laws and the companies'
governing instruments differ with respect to stockholders' rights, the
following discussion summarizes the significant differences between them.

DESCRIPTION OF McLEODUSA CAPITAL STOCK

   The following summary description of the capital stock of McLeodUSA is based
on the provisions of the McLeodUSA certificate of incorporation and bylaws and
the applicable provisions of the Delaware General Corporation Law. For
information on how to obtain copies of the McLeodUSA certificate of
incorporation and bylaws, see "Where You Can Find More Information."

Authorized and Outstanding Capital Stock of McLeodUSA

   Under the McLeodUSA certificate of incorporation, McLeodUSA has authority to
issue 2,034,000,000 shares of capital stock, consisting of 2,000,000,000 shares
of McLeodUSA Class A common stock, par value $.01 per share; 22,000,000 shares
of Class B common stock, par value $.01 per share; 2,000,000 shares of serial
preferred stock, par value $.01 per share; and 10,000,000 shares of Class II
serial preferred stock, par value $.001 per share. As of September 30, 2000,
585,128,506 shares of McLeodUSA Class A common stock, no shares of McLeodUSA
Class B common stock, 1,149,580 shares of 6.75% Series A cumulative convertible
preferred stock, par value $.01 per share, 275,000 shares of Series B
cumulative convertible preferred stock, par value $.01 per share, 125,000
shares of Series C convertible preferred stock, par value $.01 per share, and
no shares of Class II serial preferred stock, par value $.001 per share, were
issued and outstanding.

   The rights of the holders of McLeodUSA Class A common stock, Class B common
stock, Series A preferred stock, Series B preferred stock and Series C
preferred stock discussed below are subject to any rights that the McLeodUSA
board of directors may confer on holders of McLeodUSA preferred stock and Class
II preferred stock that may be issued in the future. These rights may adversely
affect the rights of the holders of any or all of these classes and series of
McLeodUSA securities.

McLeodUSA Class A Common Stock

   Voting Rights. Each holder of McLeodUSA Class A common stock is entitled to
attend all special and annual meetings of the stockholders of McLeodUSA and,
together with the holders of shares of McLeodUSA Class B common stock and the
holders of all other classes of stock entitled to attend and vote at such
meetings, to vote upon any matter, including, without limitation, the election
of directors, properly considered and acted upon by the stockholders of
McLeodUSA. Holders of McLeodUSA Class A common stock are entitled to one vote
per share.

   Liquidation Rights. In the event of any dissolution, liquidation or winding
up of McLeodUSA, whether voluntary or involuntary, the holders of McLeodUSA
Class A common stock, the holders of McLeodUSA

                                       77
<PAGE>

Class B common stock and holders of any class or series of stock entitled to
participate with the McLeodUSA Class A and Class B common stock, will become
entitled to participate in the distribution of any assets of McLeodUSA
remaining after McLeodUSA has paid, or provided for payment of, all debts and
liabilities of McLeodUSA and after McLeodUSA has paid, or set aside for
payment, to the holders of any class of stock having preference over the
McLeodUSA Class A common stock and McLeodUSA Class B common stock in the event
of dissolution, liquidation or winding up the full preferential amounts, if
any, to which they are entitled.

   Dividends. Subject to the rights of the holders of McLeodUSA preferred stock
and McLeodUSA Class II preferred stock, dividends may be paid on the McLeodUSA
Class A common stock, the McLeodUSA Class B common stock and on any class or
series of stock entitled to participate with the McLeodUSA Class A and Class B
common stock when and as declared by the McLeodUSA board of directors.

   No Preemptive or Conversion Rights. The holders of McLeodUSA Class A common
stock have no preemptive or subscription rights to purchase additional
securities issued by McLeodUSA nor any rights to convert their McLeodUSA Class
A common stock into other securities of McLeodUSA or to have their shares
redeemed by McLeodUSA.

McLeodUSA Class B Common Stock
   Voting Rights. Each holder of McLeodUSA Class B common stock is entitled to
attend all special and annual meetings of the stockholders of McLeodUSA and,
together with the holders of shares of McLeodUSA Class A common stock and the
holders of all other classes of stock entitled to attend and vote at such
meetings, to vote upon any matter, including, without limitation, the election
of directors, properly considered and acted upon by the stockholders of
McLeodUSA. Holders of McLeodUSA Class B common stock are entitled to .40 vote
per share.

   Liquidation Rights. In the event of any dissolution, liquidation or winding
up of McLeodUSA, whether voluntary or involuntary, the holders of McLeodUSA
Class B common stock, the holders of McLeodUSA Class A common stock and the
holders of any class or series of stock entitled to participate with the
McLeodUSA Class B and Class A common stock, will become entitled to participate
in the distribution of any assets of McLeodUSA remaining after McLeodUSA has
paid, or provided for payment of, all debts and liabilities of McLeodUSA and
after McLeodUSA has paid, or set aside for payment, to the holders of any class
of stock having preference over the McLeodUSA Class B common stock and
McLeodUSA Class A common stock in the event of dissolution, liquidation or
winding up the full preferential amounts, if any, to which they are entitled.

   Dividends. Subject to the rights of the holders of McLeodUSA preferred stock
and McLeodUSA Class II preferred stock, dividends may be paid on the McLeodUSA
Class B common stock, the McLeodUSA Class A common stock and on any class or
series of stock entitled to participate with the McLeodUSA Class B and Class A
common stock when and as declared by the McLeodUSA board of directors.

   Conversion into McLeodUSA Class A Common Stock; No Other Preemptive or
Conversion Rights. The shares of McLeodUSA Class B common stock may be
converted at any time at the option of the holder into fully paid and
nonassessable shares of McLeodUSA Class A common stock at the rate of one share
of McLeodUSA Class A common stock for each share of McLeodUSA Class B common
stock, as adjusted for any stock split. Except for this conversion right, the
holders of McLeodUSA Class B common stock have no preemptive or subscription
rights to purchase additional securities issued by McLeodUSA nor any rights to
convert their McLeodUSA Class B common stock into other securities of McLeodUSA
or to have their shares redeemed by McLeodUSA.

                                       78
<PAGE>

McLeodUSA Preferred Stock

   The McLeodUSA certificate of incorporation authorizes the McLeodUSA board of
directors, from time to time and without further stockholder action, to provide
for the issuance of up to 2,000,000 shares of McLeodUSA preferred stock, in one
or more series, and to fix the relative rights and preferences of the shares,
including voting powers, dividend rights, liquidation preferences, redemption
rights and conversion privileges. As of September 30, 2000, 1,149,580 shares of
Series A preferred stock, 275,000 shares of Series B preferred stock, and
125,000 shares of Series C preferred stock were issued and outstanding. Because
of its broad discretion to create and issue McLeodUSA preferred stock and Class
II preferred stock without stockholder approval, the McLeodUSA board of
directors could adversely affect the voting power of the holders of McLeodUSA
Class A common stock and, by issuing shares of McLeodUSA preferred stock and
Class II preferred stock with preferential voting, conversion or redemption
rights, could discourage any attempt to obtain control of McLeodUSA.

McLeodUSA Series A Preferred Stock

   Ranking. The Series A preferred stock, with respect to dividend rights and
rights on liquidation, dissolution or winding-up, ranks:

  .  junior to all McLeodUSA debt obligations

  .  junior to "Senior Stock," which is each class of McLeodUSA capital stock
     or series of preferred stock or Class II preferred stock established
     after the Series A preferred stock by the McLeodUSA board of directors
     that has terms which expressly provide that such class or series will
     rank senior to the Series A preferred stock

  .  on a parity with "Parity Stock," which is each class of capital stock or
     series of preferred stock or Class II preferred stock established after
     the Series A preferred stock by the McLeodUSA board of directors that
     has terms which expressly provide that such class or series will rank on
     a parity with the Series A preferred stock (and which includes the
     Series B preferred stock and Series C preferred stock, as described
     below)

  .  senior to "Junior Stock," which is all classes of McLeodUSA common
     stock, including McLeodUSA Class A common stock and Class B common
     stock, and any other class of McLeodUSA capital stock established after
     the Series A preferred stock by the McLeodUSA board of directors whose
     terms do not expressly provide that such class or series ranks senior
     to, or on a parity with, the Series A preferred stock

   Voting Rights. The holders of Series A preferred stock, except as otherwise
required under Delaware law or as provided in the Series A preferred stock
certificate of designations, are not entitled to vote on any matter required or
permitted to be voted upon by the McLeodUSA stockholders. If the Series A
preferred stock does vote, each outstanding share of Series A preferred stock
has one vote, excluding shares of Series A preferred stock held by McLeodUSA or
any entity controlled by McLeodUSA, which shares have no votes. The Series A
preferred stock certificate of designations provides that if dividends on the
Series A preferred stock are in arrears and unpaid for six or more dividend
periods, whether or not consecutive, then the holders of the outstanding shares
of Series A preferred stock will be entitled to elect to serve on the McLeodUSA
board of directors the lesser of (1) two additional members to the McLeodUSA
board of directors or (2) that number of directors constituting at least 25% of
the members of the McLeodUSA board of directors, and the number of members of
the McLeodUSA board of directors will be immediately and automatically
increased by that number. These voting rights will continue until all dividends
in arrears on the Series A preferred stock are paid in full, at which time the
term of any directors elected according to the provisions of this paragraph
(subject to the right of holders of any other preferred stock to elect these
directors) shall terminate and the number of directors constituting the
McLeodUSA board of directors will be immediately and automatically decreased by
that number (until the occurrence of any such subsequent event). While any
shares of Series A preferred stock are outstanding, McLeodUSA may not
authorize, create or increase the authorized amount of any class or series

                                       79
<PAGE>

of Senior Stock with respect to the payment of dividends or amounts upon
liquidation, dissolution or winding-up without the consent of the holders of at
least two-thirds of the outstanding shares of Series A preferred stock.
McLeodUSA may, however, without the consent of any holder of Series A preferred
stock, create additional classes of capital stock or issue series of Parity
Stock or Junior Stock.

   Liquidation Preference. Upon the voluntary or involuntary liquidation,
dissolution or winding-up of McLeodUSA, and subject to the rights of the
creditors of McLeodUSA and holders of Senior Stock and Parity Stock, each
holder of Series A preferred stock will be entitled to be paid, out of the
assets of McLeodUSA available for distribution to stockholders, an amount equal
to the liquidation preference of $250 per share of Series A preferred stock
held by the holder, plus accumulated and unpaid dividends on the Series A
preferred stock to the date fixed for liquidation, dissolution or winding-up
(including an amount equal to a prorated dividend for the period from the last
dividend payment date to the date fixed for liquidation, dissolution or
winding-up) before any distribution is made on any Junior Stock, including
McLeodUSA Class A common stock.

   Dividends. Subject to the rights of any holders of Senior Stock and Parity
Stock, holders of shares of Series A preferred stock will be entitled to
receive, when, as and if declared by the McLeodUSA board of directors out of
funds of McLeodUSA legally available for payment, cumulative dividends at the
annual rate of 6.75% per share on the liquidation preference of $250 per share
of Series A preferred stock (equivalent to $16.875 per share annually).
Dividends on the Series A preferred stock are payable quarterly and accrue from
the most recent date as to which dividends have been paid. Any dividend on the
Series A preferred stock shall be, at the option of McLeodUSA, payable (1) in
cash or (2) through the issuance of shares of McLeodUSA Class A common stock.

   Conversion into McLeodUSA Class A Common Stock; No Other Preemptive or
Conversion Rights. Shares of Series A preferred stock are convertible, in whole
or in part, at any time, at the option of the holders of the Series A preferred
stock, into shares of McLeodUSA Class A common stock at the conversion price of
$9.69 per share, subject to adjustment upon the happening of various events.
This amount is referred to herein as the Conversion Price. McLeodUSA has the
option to convert all of the shares of Series A preferred stock into shares of
McLeodUSA Class A common stock at the Conversion Price if, on or after August
15, 2002, the closing price of McLeodUSA Class A common stock has equaled or
exceeded 135% of the Conversion Price for at least 20 out of 30 consecutive
days on which the Nasdaq National Market is open for the transaction of
business. Except for this conversion right, the holders of the Series A
preferred stock have no preemptive or preferential right to purchase or
subscribe to stock, obligations, warrants or any other securities of any class
of McLeodUSA.

   Provisional Redemption. McLeodUSA may redeem Series A preferred stock at a
redemption price of 104.5% of the liquidation preference, plus accumulated and
unpaid dividends, if any, to the redemption date, on or after August 15, 2001,
but prior to August 15, 2002, if the closing price of McLeodUSA Class A common
stock equals or exceeds 150% of the Conversion Price for at least 20 trading
days within any 30 trading day period. This type of redemption is called a
Provisional Redemption. If McLeodUSA undertakes a Provisional Redemption, the
holders of shares of Series A preferred stock that are called for redemption
also will receive a payment (referred to as the "additional payment") in an
amount equal to the present value of the aggregate value of the dividends that
would thereafter have been payable on the Series A preferred stock (whether or
not such dividends have been declared) for the period from the date of the
Provisional Redemption to August 15, 2002. McLeodUSA may effect any Provisional
Redemption, in whole or in part, at its option, by payment of the redemption
price, including any additional payment, in cash, through delivery of shares of
McLeodUSA Class A common stock or a combination thereof, subject to applicable
law.

   Optional Redemption. Except under the foregoing circumstances for a
Provisional Redemption, and except under certain circumstances set forth in the
McLeodUSA certificate of incorporation (as set forth below), McLeodUSA may not
redeem the Series A preferred stock prior to August 15, 2002. Thereafter, each
share of the Series A preferred stock may be redeemed, at the option of
McLeodUSA, in whole or in part, at

                                       80
<PAGE>

any time or from time to time at the following redemption prices, plus
accumulated and unpaid dividends, if any, to the date fixed for redemption,
payable in cash. This type of redemption is referred to herein as an Optional
Redemption. If redeemed during the 12-month period commencing on August 15 (or,
if such date is not a date on which the Nasdaq National Market is open for
business, then on the next day the Nasdaq National Market is open for business)
of the years set forth below, the Optional Redemption prices, expressed as a
percentage of the liquidation preference per share, shall be:

<TABLE>
<CAPTION>
                                                                        Period
                                                                      Redemption
   Year                                                                 Price
   ----                                                               ----------
   <S>                                                                <C>
   2002.............................................................. 103.3750%
   2003.............................................................. 102.2500%
   2004.............................................................. 101.1250%
   2005 and thereafter............................................... 100.0000%
</TABLE>

   Notwithstanding any of the foregoing provisions relating to a Provisional
Redemption or an Optional Redemption, the McLeodUSA certificate of
incorporation provides that McLeodUSA may redeem shares of any class of its
capital stock (including the Series A preferred stock) to the extent necessary
to prevent the loss or secure the reinstatement of any license, operating
authority or franchise from any governmental agency. Any redemption of shares
of Series A preferred stock under such circumstances will be at the price, and
on the other terms and conditions, specified in the McLeodUSA certificate of
incorporation. These provisions are described below under "--Certain Charter
and Statutory Provisions--Mandatory Redemption."

McLeodUSA Series B and Series C Preferred Stock

   Ranking. The Series B preferred stock and Series C preferred stock, with
respect to dividend rights and rights on liquidation, dissolution or winding-
up, ranks:

  .  junior to all McLeodUSA debt obligations

  .  junior to "Senior Stock," which is each class of McLeodUSA capital stock
     or series of preferred stock or Class II preferred stock established
     after the Series B preferred stock and Series C preferred stock by the
     McLeodUSA board of directors that has terms which expressly provide that
     the class or series will rank senior to the Series B preferred stock and
     Series C preferred stock

  .  on a parity with "Parity Stock," which is the Series A preferred stock
     and each class of capital stock or series of preferred stock or Class II
     preferred stock established after the Series B preferred stock and
     Series C preferred stock by the McLeodUSA board of directors that has
     terms which expressly provide that the class or series will rank on a
     parity with the Series B preferred stock and Series C preferred stock

  .  senior to "Junior Stock," which is all classes of McLeodUSA common
     stock, including McLeodUSA Class A common stock and Class B common
     stock, and any other class of McLeodUSA capital stock established after
     the Series B preferred stock and Series C preferred stock by the
     McLeodUSA board of directors whose terms do not expressly provide that
     such class or series ranks senior to, or on a parity with, the Series B
     preferred stock and Series C preferred stock

   Voting Rights. The holders of Series B preferred stock, except as otherwise
required under Delaware law or as provided in the Series B preferred stock
certificate of designations, are not entitled to vote on any matter required or
permitted to be voted upon by the McLeodUSA stockholders other than, voting
separately as a series, to designate and elect two directors to the McLeodUSA
board of directors. However:

     (1) the entitlement of the holders of Series B preferred stock to
  designate two directors for election to the McLeodUSA board of directors,
  and the exclusive right of the holders of Series B preferred stock to vote,
  separately as a series, for the election of such designees to the McLeodUSA
  board of directors, shall cease immediately upon less than 110,000 shares
  of Series B preferred stock being outstanding, and the

                                       81
<PAGE>

  holders of the outstanding shares of the Series B preferred stock shall be
  entitled to designate one director for election to the McLeodUSA board of
  directors and, voting separately as a series, shall have the exclusive
  right to vote for the election of such designee to the McLeodUSA board of
  directors, and to designate one non-voting board observer, for as long as,
  and only for so long as, less than 110,000 shares of Series B preferred
  stock but more than 55,000 shares of Series B preferred stock remain
  outstanding;

     (2) the entitlement of the holders of outstanding shares of Series B
  preferred stock to designate one director for election to the McLeodUSA
  board of directors, and the exclusive right of the holders of outstanding
  shares of Series B preferred stock to vote separately as a series for the
  election of such designee to the McLeodUSA board of directors, and the
  exclusive right of the holders of outstanding shares of Series B preferred
  stock to designate one non-voting board observer, and the rights of such
  non-voting board observer, shall cease immediately upon 55,000 or fewer
  shares of Series B preferred stock being outstanding, and the holders of
  the outstanding shares of Series B preferred stock shall be entitled to
  designate two non-voting board observers for as long as, and only for as
  long as, 55,000 or fewer (but at least one) shares of Series B preferred
  stock remain outstanding; and

     (3) immediately upon no shares of Series B preferred stock being
  outstanding, the entitlement of the holders of Series B preferred stock to
  designate two non-voting board observers, and the rights of such board
  observers, shall cease.

   In exercising any such votes, each outstanding share of Series B preferred
stock has one vote.

   The holders of Series C preferred stock, except as otherwise required under
Delaware law or as provided in the Series C preferred stock certificate of
designations, are not entitled to vote on any matter required or permitted to
be voted upon by the McLeodUSA stockholders other than, voting separately as a
series, to designate and elect one non-voting board observer to the McLeodUSA
board of directors for so long as any shares of Series C preferred stock remain
issued and outstanding.

   In addition, the Series B preferred stock certificate of designations
provides that if dividends on the Series B preferred stock are in arrears and
unpaid for six or more dividend periods (whether or not consecutive) or
McLeodUSA has failed to discharge a redemption obligation as required under the
Series B preferred stock certificate of designations, then the holders of the
outstanding shares of Series B preferred stock will be entitled to elect one
additional director to serve on the McLeodUSA board of directors, and the
number of members of the McLeodUSA board of directors will be immediately and
automatically increased by this number. These voting rights will continue until
either all dividends in arrears on the Series B preferred stock are paid in
full or the redemption obligation is fulfilled, as the case may be, at which
time the term of the director elected according to the provisions of this
paragraph shall terminate and the number of directors constituting the
McLeodUSA board of directors will be immediately and automatically decreased by
one (until the occurrence of any such subsequent event).

   Similarly, the Series C preferred stock certificate of designations provides
that if McLeodUSA has failed to discharge a redemption obligation as required
under the Series C preferred stock certificate of designations then the holders
of the outstanding shares of Series C preferred stock will be entitled to elect
one additional director to serve on the McLeodUSA board of directors, and the
number of members of the McLeodUSA board of directors will be immediately and
automatically increased by this number. These voting rights of the Series C
preferred stock will continue until such time as such redemption obligation is
fulfilled at which time the term of the director elected according to the
provisions of this paragraph shall terminate and the number of directors
constituting the McLeodUSA board of directors will be immediately and
automatically decreased by one (until the occurrence of any such subsequent
event).

   The Series B preferred stock certificate of designations also provides that
without the consent of a majority of the outstanding shares of the Series B
preferred stock, McLeodUSA may not amend, alter or repeal any provision of its
certificate of incorporation or the Series B certificate of designations so as
to adversely affect

                                       82
<PAGE>

the preferences, rights or powers of the Series B preferred stock or to
authorize the issuance of, or to issue any, additional shares of Series B
preferred stock, provided that any amendment to change the dividend or the
liquidation preference of the Series B preferred stock will require the written
consent of the holders of two-thirds of the outstanding shares of Series B
preferred stock. The Series B preferred stock certificate of designations also
provides that the consent of a majority of the outstanding shares of Series B
preferred stock is required for McLeodUSA to create, authorize or issue any
Senior Securities. The Series C preferred stock certificate of designations
provides for similar voting rights with respect to the Series C preferred
stock.

   Liquidation Preference. Upon the voluntary or involuntary liquidation,
dissolution or winding-up of McLeodUSA, and subject to the rights of the
creditors of McLeodUSA and holders of Senior Stock and Parity Stock, the
holders of the Series B preferred stock and Series C preferred stock taken
together will be entitled to be paid, out of the assets of McLeodUSA available
for distribution to stockholders, an amount equal to the greater of (1) the
liquidation preference of $2,500 per share of Series B preferred stock and
Series C preferred stock, plus accumulated and unpaid dividends thereon to the
date fixed for liquidation, dissolution or winding-up (including an amount
equal to a prorated dividend for the period from the last dividend payment date
to the date fixed for liquidation, dissolution or winding-up) or (2) the
aggregate amount that would have been received with respect to the shares of
Series B preferred stock and Series C preferred stock if these shares had been
converted to McLeodUSA Class A common stock immediately prior to the
liquidation, dissolution or winding-up, before any distribution is made on any
Junior Stock, including McLeodUSA Class A common stock. If, upon any
liquidation, dissolution or winding-up, the assets or proceeds of McLeodUSA,
shall be insufficient to pay in full the amounts under clause (1) of the
preceding sentence and liquidating payments on all Parity Securities, then the
assets or proceeds, shall (A) be distributed among the shares of Series B
preferred stock and Series C preferred stock taken together and all other
Parity Securities ratably in accordance with the respective amounts that would
be payable on such shares and any other Parity Securities if all amounts
payable thereon were paid in full and (B) the amount distributable under clause
(A) to the Series B preferred stock and Series C preferred stock taken
together, shall be distributed to the holders of the Series B preferred stock
and Series C preferred stock according to the formulas specified in the Series
B preferred stock certificate of designations and Series C preferred stock
certificate of designations.

   Dividends. Subject to the rights of any holders of Senior Stock and Parity
Stock, holders of shares of Series B preferred stock will be entitled to
receive, when, as and if declared by the McLeodUSA board of directors out of
funds of McLeodUSA legally available for payment, cumulative dividends at the
annual rate of $127.273 per share. Dividends on the Series B preferred stock
are payable quarterly and accrue from the most recent date as to which
dividends have been paid. Holders of shares of Series C preferred stock are not
entitled to receive any dividends on their shares of Series C preferred stock.
Notwithstanding the above, if at any time prior to September 15, 2004,
McLeodUSA pays a dividend in cash or property other than in shares of capital
stock on its Class A common stock then McLeodUSA must also declare and pay a
dividend on the Series B preferred stock and Series C preferred stock in an
amount equal to that which would have been paid if the Series B preferred stock
and Series C preferred stock taken together had been converted into McLeodUSA
Class A common stock on the date established as the record date with respect to
such dividend on the McLeodUSA Class A common stock. The dividend shall be
distributed to the holders of the Series B preferred stock and Series C
preferred stock according to the formulas specified in the Series B preferred
stock certificate of designations and Series C preferred stock certificate of
designations.

   Conversion into McLeodUSA Class A Common Stock; No Other Preemptive or
Conversion Rights.  Shares of Series B preferred stock and Series C preferred
stock are convertible, in whole or in part, at any time, at the option of the
holders of the shares, into shares of McLeodUSA Class A common stock at the
conversion price of $12.1666 per share, subject to adjustment upon the
happening of various events; provided that upon the exercise by any holder of
Series B preferred stock of this conversion option, a proportional amount,
based on the percentage of each series of shares outstanding, of the Series C
preferred stock shall automatically convert in accordance with the terms of the
Series C preferred stock certificate of designations. Except for this
conversion right, the holders of the Series B preferred stock and Series C
preferred stock have no preemptive or

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preferential right to purchase or subscribe to stock, obligations, warrants or
any other securities of any class of McLeodUSA.

   Optional Redemption. Except under certain circumstances set forth in the
McLeodUSA certificate of incorporation (as set forth below), McLeodUSA may not
redeem the Series B preferred stock and Series C preferred stock prior to
September 15, 2006. Thereafter, each share of the Series B preferred stock and
Series C preferred stock may be redeemed, at the option of McLeodUSA, in whole
or in part, at any time or from time to time at a redemption price per share
equal to the liquidation preference of that share, plus accumulated and unpaid
dividends, if any, to the date fixed for redemption, payable in cash; provided
that McLeodUSA shall only be entitled to redeem shares of the Series B
Preferred Stock if shares of the Series C Preferred Stock are also redeemed on
a proportional basis based on the percentage of each series of shares then
outstanding. This type of redemption is referred to herein as an Optional
Redemption.

   Notwithstanding any of the foregoing provisions relating to an Optional
Redemption, the McLeodUSA certificate of incorporation provides that McLeodUSA
may redeem shares of any class of its capital stock (including the Series B
preferred stock and Series C preferred stock) to the extent necessary to
prevent the loss or secure the reinstatement of any license, operating
authority or franchise from any governmental agency. Any redemption of shares
of Series B preferred stock and Series C preferred stock under such
circumstances will be at the price, and on the other terms and conditions,
specified in the McLeodUSA certificate of incorporation. These provisions are
described below under "--Certain Charter and Statutory Provisions--Mandatory
Redemption."

   Mandatory Redemption. To the extent McLeodUSA shall have funds legally
available therefor, during the 180-day period commencing on September 15, 2009,
the holders of the Series B preferred stock and Series C preferred stock shall
have the right to cause McLeodUSA to redeem at any time in whole or from time
to time in part outstanding shares of Series B preferred stock and Series C
preferred stock, if any, at a redemption price per share in cash equal to the
liquidation preference, plus accumulated and unpaid dividends, if any, without
interest; provided that upon any election by holders of the Series B preferred
stock to exercise this redemption right McLeodUSA shall be required to redeem a
proportional amount of the Series C preferred stock.

McLeodUSA Class II Preferred Stock

   The McLeodUSA certificate of incorporation authorizes the McLeodUSA board of
directors, from time to time and without further stockholder action, to provide
for the issuance of up to 10,000,000 shares of McLeodUSA Class II preferred
stock, in one or more series, and to fix the relative rights and preferences of
the shares, including voting powers, dividend rights, liquidation preferences,
redemption rights and conversion privileges. As of September 30, 2000, no
shares of Class II preferred stock were issued and outstanding. All shares of
Class II preferred stock to be issued, from time to time, in one or more
series, shall rank on a parity with the Series A preferred stock, Series B
preferred stock and Series C preferred stock (the "Existing Preferred Stock")
with respect to dividend rights and rights on liquidation, dissolution and
winding up of McLeodUSA, except (1) where the terms of the series of Class II
preferred stock may expressly provide that such series shall be junior to the
Existing Preferred Stock and (2) subject to any required approval or consent of
the holders of Existing Preferred Stock, the terms of any series of Class II
preferred stock may expressly provide that it shall be senior to the Existing
Preferred Stock. Because of its broad discretion to create and issue McLeodUSA
preferred stock and Class II preferred stock without stockholder approval, the
McLeodUSA board of directors could adversely affect the voting power of the
holders of McLeodUSA Class A common stock and, by issuing shares of McLeodUSA
preferred stock and Class II preferred stock with preferential voting,
conversion or redemption rights, could discourage any attempt to obtain control
of McLeodUSA.

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STOCKHOLDERS' AGREEMENTS

   On March 10, 2000, McLeodUSA entered into a further amendment and
restatement of a stockholders' agreement originally entered into on November
18, 1998 with several of its significant stockholders consisting of Alliant
Energy Corporation and various of its affiliates, Clark and Mary McLeod, and
Richard and Gail Lumpkin and various trusts for the benefit of their family.

   The further amended and restated November 1998 stockholders' agreement
provides, among other things, that:

  .  until December 31, 2001, the parties will not sell any equity securities
     of McLeodUSA, or any other securities convertible into or exchangeable
     for equity securities of McLeodUSA, without receiving the prior written
     consent of the McLeodUSA board of directors, except for transfers of the
     restricted securities specifically permitted by the agreement

  .  to the extent the McLeodUSA board of directors approves a transfer of
     equity securities of McLeodUSA by a party, the other parties are
     automatically granted transfer rights

  .  the McLeodUSA board of directors will determine on a quarterly basis the
     aggregate number, if any, of shares of Class A common stock, not to
     exceed in the aggregate 900,000 shares per quarter, that the parties may
     sell during designated trading periods following the release of the
     quarterly financial results of McLeodUSA

  .  to the extent the McLeodUSA board of directors grants registration
     rights to a party in connection with a sale of securities of McLeodUSA
     by that party, it will grant similar registration rights to the other
     parties

  .  the McLeodUSA board of directors will determine for each of 2000 and
     2001 the aggregate number, if any, of shares of Class A common stock,
     not to exceed in the aggregate on a per year basis a number of shares
     equal to 15% of the total number of shares of Class A common stock
     beneficially owned by the parties as of December 31, 1998, to be
     registered by McLeodUSA under the Securities Act for sale by the parties

  .  in any underwritten offering of shares of Class A common stock, other
     than an offering on a registration statement on Form S-4 or Form S-8 or
     any other form which would not permit the inclusion of shares of Class A
     common stock owned by the parties, the McLeodUSA board of directors will
     determine the aggregate number, if any, of shares of Class A common
     stock, not to exceed on a per year basis a number of shares equal to 15%
     of the total number of shares of Class A common stock beneficially owned
     by the parties as of December 31, 1998, to be registered by McLeodUSA
     for sale by the parties in the offering

  .  McLeodUSA may subsequently determine not to register any shares of the
     parties under the Securities Act and may either not file a registration
     statement or otherwise withdraw or abandon a registration statement
     previously filed

   Under the further amended and restated November 1998 stockholders'
agreement, as amended, each party also agreed, until it owns less than
7,500,000 shares of Class A common stock, to vote its shares and take all
action within its power to:

  .  establish the size of the McLeodUSA board of directors at up to 14
     directors

  .  cause to be elected to the McLeodUSA board of directors one director
     designated by Alliant Energy for so long as it owns at least 7,500,000
     shares of Class A common stock

  .  cause to be elected to the McLeodUSA board of directors three directors
     who are executive officers of McLeodUSA designated by Clark McLeod for
     so long as Clark and Mary McLeod collectively own at least 7,500,000
     shares of Class A common stock

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  .  cause Richard Lumpkin to be elected to the McLeodUSA board of directors
     for so long as Richard Lumpkin and various other parties related to Mr.
     Lumpkin collectively own at least 7,500,000 shares of Class A common
     stock

  .  cause to be elected to the McLeodUSA board of directors up to nine non-
     employee directors nominated by the board

   The further amended and restated November 1998 stockholders' agreement
terminates on December 31, 2001. In addition, if during each of 2000 and 2001
McLeodUSA has not provided a party a reasonable opportunity to sell an
aggregate number of shares of Class A common stock equal to not less than 15%
of the total number of shares of Class A common stock beneficially owned by a
party as of December 31, 1998, then that party may terminate the agreement as
it applies to that party.

   On March 10, 2000, McLeodUSA also entered into a further amendment and
restatement of a stockholders' agreement originally entered into on January 7,
1999 with the parties to the stockholders' agreement described above and M/C
Investors L.L.C. and Media/Communications Partners III Limited Partnership in
connection with the acquisition by McLeodUSA of Ovation Communications, Inc.

   The further amended and restated January 1999 stockholders' agreement
provides that, until December 31, 2001, the M/C entities will not sell any
equity securities of McLeodUSA, or any other securities convertible into or
exchangeable for equity securities of McLeodUSA, received pursuant to
McLeodUSA's acquisition of Ovation Communications, without receiving the prior
written consent of the McLeodUSA board of directors, except for transfers of
the restricted securities specifically permitted by the agreement. The further
amended and restated January 1999 stockholders' agreement also contains various
provisions intended to insure that the M/C entities and the parties to the
further amended and restated November 1998 stockholders' agreement are treated
on a basis generally similar to one another in connection with permitted sales
and registration of securities of McLeodUSA under such agreements. In addition,
for so long as the M/C entities own at least 7,500,000 shares of Class A common
stock, the M/C entities have agreed to vote their shares in accordance with the
voting agreement contained in the further amended and restated November 1998
stockholders' agreement, as amended, and the other parties have agreed to vote
their shares to cause to be elected to the McLeodUSA board of directors one
director designated by the M/C entities.

   The further amended and restated January 1999 stockholders' agreement
terminates on December 31, 2001. In addition, if (1) during each of 2000 and
2001, McLeodUSA has not provided the M/C entities an opportunity to register
under the Securities Act for sale an aggregate number of shares of Class A
common stock equal to not less than 15% of the total number of shares of Class
A common stock beneficially owned by the M/C entities as a result of the
acquisition of Ovation Communications, or (2) the further amended and restated
November 1998 stockholders' agreement has been terminated by all parties to
such agreement, then the M/C entities may terminate the further amended and
restated January 1999 stockholders' agreement. The further amended and restated
January 1999 stockholders' agreement will be terminated with respect to parties
other than the M/C entities and McLeodUSA at the time as the further amended
and restated November 1998 stockholders' agreement is terminated with respect
to such other parties.

   On August 10, 2000, McLeodUSA entered into an amended and restated
stockholders' agreement originally entered into on March 30, 2000 with Kwok Li
and Linsang Partners, LLC, a limited liability company controlled by Mr. Li, in
connection with the acquisition of Splitrock Services by McLeodUSA. Such
amended and restated stockholders' agreement provides, among other things,
that:

  .  until December 31, 2002, Mr. Li and Linsang Partners will not sell
     approximately 30.1 million shares of Class A common stock which were
     received pursuant to McLeodUSA's acquisition of Splitrock Services
     without receiving the prior written consent of the McLeodUSA board of
     directors, except for transfers of the restricted securities
     specifically permitted by the agreement

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  .  the shares of Class A common stock restricted by the stockholders'
     agreement do not include approximately 4.4 million shares of Class A
     common stock which were also received by Mr. Li, his wife and Linsang
     Partners

  .  for the period commencing as of August 10, 2000 and ending December 31,
     2000, Mr. Li and Linsang Partners may sell up to an aggregate number of
     shares of Class A common stock which result in aggregate gross proceeds
     of $105 million

  .  for each of 2001 and 2002, Mr. Li and Linsang may sell up to an
     aggregate of 4.2 million shares of Class A common stock, provided that
     if Mr. Li and Linsang transfer more than 200,000 shares of Class A
     common stock on any single day and McLeodUSA determines that such
     transfer has adversely affected its stock price, then McLeodUSA may
     impose a 30 day suspension period on any further sales by the parties

  .  Mr. Li may pledge to a nationally recognized financial institution
     certain shares of Class A common stock to permit certain financings by
     Mr. Li, provided the pledgee of such shares takes the shares subject to
     the restrictions in the stockholders' agreement

  .  the stockholders' agreement terminates on December 31, 2002

LIMITATION OF LIABILITY AND INDEMNIFICATION

   Limitations of Director Liability. Section 102(b)(7) of the Delaware General
Corporation Law authorizes corporations to limit or eliminate the personal
liability of directors to corporations and their stockholders for monetary
damages for breach of directors' fiduciary duty of care. Although Section
102(b)(7) does not change directors' duty of care, it enables corporations to
limit available relief to equitable remedies such as injunction or rescission.
The McLeodUSA certificate of incorporation limits the liability of directors to
McLeodUSA or its stockholders to the full extent permitted by Section
102(b)(7). Specifically, directors of McLeodUSA are not personally liable for
monetary damages to McLeodUSA or its stockholders for breach of the director's
fiduciary duty as a director, except for liability for:

  .  any breach of the director's duty of loyalty to McLeodUSA or its
     stockholders

  .  acts or omissions not in good faith or that involve intentional
     misconduct or a knowing violation of law

  .  unlawful payments of dividends or unlawful stock repurchases or
     redemptions as provided in Section 174 of the Delaware General
     Corporation Law

  .  any transaction from which the director derived an improper personal
     benefit

   Indemnification. To the maximum extent permitted by law, the McLeodUSA
bylaws provide for mandatory indemnification of directors and officers of
McLeodUSA against any expense, liability or loss to which they may become
subject, or which they may incur as a result of being or having been a director
or officer of McLeodUSA. In addition, McLeodUSA must advance or reimburse
directors and officers for expenses incurred by them in connection with
indemnifiable claims. McLeodUSA also maintains directors' and officers'
liability insurance.

CERTAIN CHARTER AND STATUTORY PROVISIONS

   Classified Board. The McLeodUSA certificate of incorporation provides for
the division of the McLeodUSA board of directors into three classes of
directors, serving staggered three-year terms. The McLeodUSA certificate of
incorporation further provides that the approval of the holders of at least
two-thirds of the shares entitled to vote on the certificate of incorporation
and the approval of a majority of the entire McLeodUSA board of directors are
necessary for the alteration, amendment or repeal of specific sections of the
McLeodUSA certificate of incorporation relating to the election and
classification of the McLeodUSA board of directors, limitation of director
liability, indemnification and the vote requirements for these amendments to
the

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McLeodUSA certificate of incorporation. These provisions may have the effect of
deterring hostile takeovers or delaying changes in control or management of
McLeodUSA.

   Section 203 of the Delaware General Corporation Law. McLeodUSA is subject to
the provisions of Section 203 of the Delaware General Corporation Law. In
general, this statute prohibits a publicly held Delaware corporation such as
McLeodUSA from engaging in a business combination with an interested
stockholder for a period of three years after the date of the transaction in
which the person became an interested stockholder, unless:

  .  prior to that date, the corporation's board of directors approved either
     the business combination or the transaction that resulted in the
     stockholder becoming an interested stockholder,

  .  upon consummation of the transaction that resulted in that person
     becoming an interested stockholder, the interested stockholder owned at
     least 85% of the voting stock of the corporation outstanding at the time
     the transaction commenced, excluding, for purposes of determining the
     number of shares outstanding, shares owned by specified directors or
     specified employee stock plans, or

  .  on or after the date the stockholder became an interested stockholder,
     the business combination is approved by the corporation's board of
     directors and authorized by the affirmative vote, and not by written
     consent, of at least two-thirds of the outstanding voting stock of the
     corporation excluding that stock owned by the interested stockholder

   A "business combination" includes a merger, asset sale or other transaction
resulting in a financial benefit to the interested stockholder. An "interested
stockholder" is a person, other than the corporation and any direct or indirect
wholly-owned subsidiary of the corporation, who together with affiliates and
associates, owns or, as an affiliate or associate, within three years prior,
did own 15% or more of the corporation's outstanding voting stock.

   Section 203 expressly exempts from the requirements described above any
business combination by a corporation with an interested stockholder who became
an interested stockholder at a time when the section did not apply to the
corporation. As permitted by the Delaware General Corporation Law, the original
McLeodUSA certificate of incorporation provided that it would not be governed
by Section 203. Several stockholders, including Clark and Mary McLeod and
Alliant Energy Corporation, became interested stockholders within the meaning
of Section 203 while that certificate of incorporation was in effect.
Accordingly, future transactions between McLeodUSA and any of these
stockholders will not be subject to the requirements of Section 203.

   Mandatory Redemption. The McLeodUSA certificate of incorporation empowers
the McLeodUSA board of directors to redeem any of the McLeodUSA outstanding
capital stock at a price determined by the McLeodUSA board of directors, which
price will be at least equal to the lesser of:

  .  fair market value, as determined in accordance with the McLeodUSA
     certificate of incorporation, or

  .  in the case of a "Disqualified Holder," such holder's purchase price, if
     the stock was purchased within one year of such redemption,

  .  to the extent necessary to prevent the loss or secure the reinstatement
     of any license, operating authority or franchise from any governmental
     agency. A "Disqualified Holder" is any holder of shares of stock of
     McLeodUSA whose holding of McLeodUSA stock may result in the loss of, or
     failure to secure the reinstatement of, any license or franchise from
     any governmental agency held by McLeodUSA or any of its subsidiaries to
     conduct any portion of the business of McLeodUSA or any of its
     subsidiaries. Under the Telecommunications Act of 1996, non-U.S.
     citizens or their representatives, foreign governments or their
     representatives, or corporations organized under the laws of a foreign
     country may not own, in the aggregate, more than 20% of a common carrier
     licensee or more than 25% of the parent of a common carrier licensee if
     the FCC determines that the public interest would be served by
     prohibiting this ownership.

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   Unanimous Written Consent to Stockholder Action Without a Meeting. The
McLeodUSA certificate of incorporation provides that no corporate stockholder
action may be taken without a meeting of stockholders unless there is unanimous
written consent of the McLeodUSA stockholders, except to the extent otherwise
provided under the terms of any series of McLeodUSA preferred stock or Class II
preferred stock.

TRANSFER AGENT AND REGISTRAR

   The transfer agent and registrar for the McLeodUSA Class A common stock is
Wells Fargo Bank Minnesota, N.A.

COMPARISON OF McLEODUSA CLASS A COMMON STOCK AND CAPROCK COMMON STOCK

   The rights of CapRock stockholders are currently governed by the Texas
Business Corporation Act, the CapRock articles of incorporation and the CapRock
bylaws. In accordance with the merger agreement, at the effective time of the
merger each issued and outstanding share of CapRock common stock will be
converted into the right to receive 0.3876 of a share of McLeodUSA Class A
common stock. Accordingly, upon completion of the merger, the rights of CapRock
stockholders who become stockholders of McLeodUSA will be governed by the
Delaware General Corporation Law and the McLeodUSA certificate of incorporation
and bylaws. The following are summaries of the material differences between the
rights of CapRock stockholders and the rights of McLeodUSA stockholders. For
additional information, see "Where You Can Find More Information."

Authorized Capital

   CapRock. As of the record date, the authorized capital stock of CapRock
consisted of (1) 200,000,000 shares of CapRock common stock, par value $.01 per
share, of which 38,729,536 shares were issued and outstanding and (2)
20,000,000 shares of preferred stock, par value $.01 per share, of which no
shares were issued and outstanding.

   McLeodUSA. As of September 30, 2000, the authorized capital stock of
McLeodUSA consisted of (1) 2,000,000,000 shares of McLeodUSA Class A common
stock, of which 585,128,506 shares were issued and outstanding; (2) 22,000,000
shares of McLeodUSA Class B common stock, par value $.01 per share, of which no
shares were issued and outstanding; (3) 2,000,000 shares of McLeodUSA serial
preferred stock, par value $.01 per share, of which (a) 1,149,580 shares of
6.75% Series A cumulative convertible preferred stock, par value $.01 per
share, (b) 275,000 shares of Series B cumulative convertible preferred stock,
par value $.01 per share, and (c) 125,000 shares of Series C convertible
preferred stock, par value $.01 per share, were issued and outstanding; and (4)
10,000,000 shares of Class II serial preferred stock, par value $.001 per
share, of which no shares were issued and outstanding.

Board of Directors

   CapRock. Under the Texas Business Corporation Act, the articles of
incorporation or bylaws of a corporation may set the number of directors or
provide the manner of determining the number of directors. The CapRock bylaws
provide the number of directors of CapRock will not be less than one and will
be determined from time to time by resolution adopted by the CapRock
stockholders or the CapRock board of directors. The current number of CapRock
directors is six. The Texas Business Corporation Act permits the bylaws of a
corporation to provide that directors be divided into classes. The CapRock
bylaws do not provide for classification of the board of directors. Under the
Texas Business Corporation Act and the CapRock bylaws, directors are elected at
the annual stockholders meeting by a plurality of the voting rights represented
by the shares present in person or represented by proxy and entitled to vote in
the election, and hold office until the next annual meeting of stockholders and
until his or her successor is duly elected and qualified.


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   The Texas Business Corporation Act and the CapRock bylaws provide that a
quorum at any meeting of the CapRock board of directors consists of a majority
of the total number of directors. The CapRock bylaws provide that a majority of
the directors present at any meeting at which a quorum is present is required
to approve any CapRock board of directors' action, except for the appointment
of committees by the CapRock board of directors, which requires a majority of
the full board of directors, and the filling of vacancies on the board of
directors, which may be acted upon by a majority of the remaining directors,
though less than a quorum.

   McLeodUSA. The Delaware General Corporation Law permits the certificate of
incorporation or the bylaws of the corporation to govern the number and terms
of directors. The McLeodUSA certificate of incorporation provides that the
number of directors will be specified in the McLeodUSA bylaws. Under the
McLeodUSA bylaws, the number of McLeodUSA directors will be between three and
15, with the specific number determined by resolution of the McLeodUSA board of
directors. The current number of McLeodUSA directors is 13. The Delaware
General Corporation Law permits the certificate of incorporation to provide for
the division of directors into up to three classes, with the term of office of
each class of directors expiring in successive years. Under the McLeodUSA
certificate of incorporation, the McLeodUSA board of directors is divided into
three classes as nearly equal in number as possible, and the McLeodUSA
directors are elected for three-year terms by a plurality of the voting rights
represented by the shares present in person or represented by proxy at the
annual stockholders meeting and entitled to vote in the election.

   Under the McLeodUSA bylaws, a quorum at any meeting of the McLeodUSA board
of directors consists of a majority of the total number of directors, and a
majority of the directors present at any meeting at which a quorum is present,
is required to approve any McLeodUSA board of directors' action except as may
be otherwise specifically provided by the Delaware General Corporation Law, or
the McLeodUSA certificate of incorporation or bylaws.

Cumulative Voting

   CapRock. Under the Texas Business Corporation Act, stockholders are allowed
to cumulate their votes in the election of directors unless prohibited in the
corporation's articles of incorporation. The CapRock articles of incorporation
expressly prohibit cumulative voting.

   McLeodUSA. The Delaware General Corporation Law permits cumulative voting
for the election of directors if provided for by the certificate of
incorporation. The McLeodUSA certificate of incorporation does not provide for
cumulative voting.

Newly Created Directorships and Vacancies

   CapRock. Under the Texas Business Corporation Act, the number of directors
may be increased or decreased by amendment to, or in the manner provided in,
the articles of incorporation or the bylaws, but any decrease may not shorten
the term of any incumbent director. Under the CapRock bylaws, the number of
directors may be increased or decreased by resolution of the CapRock
stockholders or the CapRock board of directors. Under the Texas Business
Corporation Act and the CapRock bylaws, any directorship to be filled by reason
of an increase in the number of directors may be filled by election at an
annual or special meeting of stockholders called for that purpose or by the
vote of the CapRock board of directors, for the term of office continuing only
until the next election of directors by the stockholders. The board of
directors may not fill more than two such directorships during the period
between two successive annual meetings of stockholders.

   Under the Texas Business Corporation Act and the CapRock bylaws, any vacancy
occurring in the board of directors may be filled by election at an annual or
special meeting of stockholders called for that purpose or by the vote of a
majority of the remaining directors, even if less than a quorum of the board of
directors. A director elected to fill a vacancy will be elected for the
unexpired term of his or her predecessor in office.


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   McLeodUSA. Under the Delaware General Corporation Law and the McLeodUSA
certificate of incorporation, vacancies and newly created directorships
resulting from an increase in the authorized number of directors elected by all
of the holders of McLeodUSA Class A common stock and McLeodUSA Class B common
stock may be filled by a majority of the McLeodUSA directors then in office,
even if less than a quorum, or by a sole remaining director. When the number of
directors is changed, any newly created or eliminated directorship will be
apportioned among the classes of directors so as to make all classes as nearly
equal in number as possible. A decrease in the number of directors may not
shorten the term of the incumbent director.

Removal of Directors

   CapRock. Under the Texas Business Corporation Act and the CapRock bylaws,
any director or the entire board of directors of a corporation with an
unclassified board, such as CapRock, may be removed, with or without cause, by
the vote of the holders of a majority of the shares entitled to vote at any
meeting of stockholders called expressly for such purpose.

   McLeodUSA. Neither the McLeodUSA certificate of incorporation nor the bylaws
includes a provision setting forth the procedure for the removal of directors.
Under the Delaware General Corporation Law, any director or the entire board of
directors of a corporation with a classified board, such as McLeodUSA, may be
removed by the holders of a majority of shares then entitled to vote at an
election of directors, but only for cause.

Committees of the Board of Directors

   CapRock. Under the Texas Business Corporation Act and the CapRock bylaws,
the CapRock board of directors may designate one or more committees, from among
its members. The CapRock bylaws provide that these committees may be appointed
by a resolution adopted by a majority of the full CapRock board of directors.
The CapRock board of directors currently has an audit committee, a compensation
committee and a nominating committee.

   McLeodUSA. Under the Delaware General Corporation Law and the McLeodUSA
bylaws, the McLeodUSA board of directors may designate one or more committees,
which must consist of McLeodUSA directors. The McLeodUSA board of directors
currently has a compensation committee, an audit committee and an executive
committee.

Officers

   CapRock. Under the Texas Business Corporation Act and the CapRock bylaws,
the CapRock principal officers consist of a President and a Secretary, elected
by the CapRock board of directors. The CapRock board of directors may elect or
appoint a chairman of the board and other officers and assistant officers. Any
two or more offices may be held by the same person. Under the CapRock bylaws,
the board of directors may remove any officer when it deems removal will serve
the best interest of CapRock, by a majority vote of the directors present at a
meeting of the CapRock board of directors where a quorum is represented.

   McLeodUSA. Under the Delaware General Corporation Law and the McLeodUSA
bylaws, the McLeodUSA officers consist of a President, a Secretary and a
Treasurer, and other officers and assistant officers as may be elected or
appointed by the McLeodUSA board of directors. Any number of offices may be
held by the same person, except that in no event shall the President and
Secretary be the same person. The McLeodUSA board of directors may remove any
officer, with or without cause, by the affirmative vote of a majority of the
McLeodUSA board of directors.

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Special Meetings of Stockholders

   CapRock. The Texas Business Corporation Act provides that a special meeting
of stockholders may be called by the president, the board of directors or other
persons authorized in the corporation's articles of incorporation or bylaws, or
by holders of not less than 10% of all shares entitled to vote at the meeting,
unless the articles of incorporation provide for a different percentage not
greater than 50%. The CapRock bylaws provide that special meetings of
stockholders may be called by the chief executive officer, the president, the
board of directors, or the holders of not less than 10% of all shares entitled
to vote at the meeting.

   McLeodUSA. Under the Delaware General Corporation Law, the board of
directors or any person authorized in the corporation's certificate of
incorporation or bylaws may call a special meeting of stockholders. Under the
McLeodUSA bylaws, a special meeting of the McLeodUSA stockholders may be called
by the board of directors, the chairperson, the chief executive officer or the
president.

Quorum at Stockholder Meetings

   CapRock. Under the Texas Business Corporation Act and the CapRock bylaws,
the holders of record of a majority of the shares entitled to vote at a
stockholder meeting, present in person or represented by proxy, constitute a
quorum for the transaction of business. In the absence of a quorum, the
stockholders present in person or represented by proxy at a meeting may adjourn
the meeting until a quorum is present or represented.

   McLeodUSA. Under the McLeodUSA bylaws, the holders of a majority of the
voting rights represented by the shares issued and outstanding and entitled to
vote at the meeting, and who are present in person or represented by proxy,
constitute a quorum at all meetings of the stockholders for the transaction of
business. Where a separate vote by a class or classes is required, a majority
of the outstanding shares of the class or classes, present in person or
represented by proxy, will constitute a quorum entitled to take action with
respect to that vote on that matter. The holders of a majority of the voting
rights represented by the shares represented at a meeting, whether or not a
quorum is present, may adjourn the meeting from time to time.

Stockholder Action by Written Consent

   CapRock. Under the Texas Business Corporation Act, stockholders may take any
action without a meeting, without prior notice and without a vote if all
stockholders entitled to vote on the matter consent to the action in writing.
If a corporation's articles of incorporation so provide, stockholders may take
any action under the Texas Business Corporation Act by a consent signed by the
holders of shares having not less than the minimum number of votes that would
be necessary to take such action at a meeting. The CapRock articles of
incorporation and bylaws provide that any action required to be taken or that
may be taken at any meeting of stockholders, may be taken without a meeting,
without prior notice, and without a vote, if written consents are signed by the
holders of shares having not less than the minimum number of votes that would
be necessary to take such action at a meeting.

   McLeodUSA. Under the Delaware General Corporation Law unless the certificate
of incorporation provides otherwise, stockholders may take any action without a
meeting, without prior notice and without a vote, if written consents are
signed by the holders of not less than the minimum number of votes that would
be necessary to authorize or take such action at a meeting. Under the McLeodUSA
certificate of incorporation, the McLeodUSA stockholders may not take corporate
action without a meeting unless there is unanimous written consent of the
stockholders entitled to vote on the matter, except to the extent otherwise
provided under the terms of any series of preferred stock or Class II preferred
stock.

Advance Notice of Stockholder-Proposed Business at Annual Meetings

   CapRock. Neither the CapRock articles of incorporation nor the bylaws
include a provision which requires that advance notice be given to CapRock of
stockholder-proposed business to be conducted at annual meetings.

                                       92
<PAGE>

   McLeodUSA. Neither the McLeodUSA certificate of incorporation nor the bylaws
include a provision which requires that advance notice be given to McLeodUSA of
stockholder-proposed business to be conducted at annual meetings.

Amendment of Governing Documents

   CapRock. Under the Texas Business Corporation Act, an amendment of the
articles of incorporation requires a resolution of the board of directors and
the approval of the holders of at least two-thirds of the outstanding shares
entitled to vote on the amendment, unless the articles of incorporation require
the vote of a different number, not less than a majority, of shares. Each class
or series of stock affected must also approve by at least a two-thirds vote
amendments that make changes that adversely affect the rights of that class or
series, unless the articles of incorporation require a vote of a different
number, not less than a majority, of shares. The CapRock articles of
incorporation require only a majority of the outstanding shares entitled to
vote on the amendment to approve the amendment. If any class or series of
shares is entitled to vote as a class on the amendment, a majority of the
outstanding shares within each class or series entitled to vote must approve
the amendment in addition to a majority of the outstanding shares otherwise
entitled to vote on the amendment.

   Under the Texas Business Corporation Act, a corporation's board of directors
may amend or repeal the corporation's bylaws or adopt new bylaws unless (1) the
articles of incorporation reserve the power exclusively to the stockholders in
whole or in part or (2) the stockholders in amending, repealing or adopting a
particular bylaw expressly provide that the board of directors may not amend or
repeal that bylaw. Unless the articles of incorporation or a bylaw adopted by
the stockholders provide otherwise, the stockholders may amend, repeal or adopt
bylaws even though the bylaws may also be amended, repealed or adopted by the
board of directors. Neither the CapRock articles of incorporation nor the
bylaws provide otherwise, nor do they restrict the CapRock board of directors
in amending or repealing the bylaws.

   McLeodUSA. Under the Delaware General Corporation Law, an amendment to a
corporation's certificate of incorporation requires the recommendation of a
corporation's board of directors, the approval of a majority of all shares
entitled to vote on the amendment, voting together as a single class, and the
approval of a majority of the outstanding stock of each class entitled to vote
separately on the amendment unless a higher vote is required in the
corporation's certificate of incorporation. The McLeodUSA certificate of
incorporation provides that it may be amended in accordance with and as
prescribed by Delaware law. The McLeodUSA certificate of incorporation further
provides that the affirmative vote of at least two-thirds of the voting rights
represented by the shares entitled to vote on the amendment and the affirmative
vote of a majority of the entire McLeodUSA board of directors is required to
amend, alter or repeal Sections 5.1 (election of directors) and 5.3 (limitation
of liability), Article 6 (indemnification), and Article 8 (amendment of
certificate of incorporation) of the McLeodUSA certificate of incorporation.

   Under the Delaware General Corporation Law, stockholders have the power to
amend, adopt or repeal a corporation's bylaws. The corporation's certificate of
incorporation may also grant this power to the board of directors. The
McLeodUSA certificate of incorporation grants the McLeodUSA board of directors
the power to adopt, amend and repeal the McLeodUSA bylaws.

Vote Required for Mergers

   CapRock. Under the Texas Business Corporation Act, a merger may become
effective without the approval of the surviving corporation's stockholders in
certain circumstances. Where stockholder approval is necessary, approval of a
merger requires a two-thirds affirmative vote of the outstanding shares
entitled to vote on the merger, and in circumstances where a class or series of
shares are entitled to vote as a class, the merger must be approved by the
holders of two-thirds of the outstanding shares of each class or series
entitled to vote, unless the articles of incorporation otherwise require a
different number of shares. The CapRock articles of incorporation and bylaws
require the affirmative vote of a majority of the outstanding shares, or class
of shares, entitled to vote on such action.

                                       93
<PAGE>

   McLeodUSA. Under the Delaware General Corporation Law, a merger may become
effective without the approval of the corporation's stockholders in certain
circumstances. Where stockholder approval is required, a merger may be adopted
by the affirmative vote of a majority of the outstanding stock entitled to vote
on the merger.

Required Vote for Disposition of Assets

   CapRock. Under the Texas Business Corporation Act, the sale, lease, exchange
or other disposition of all, or substantially all, the property and assets of a
corporation if not made in the usual and regular course of business requires
the approval of the holders of at least two-thirds of the outstanding shares
entitled to vote thereon, unless the articles of incorporation require the vote
of a different number of shares. The CapRock articles of incorporation and
bylaws require the affirmative vote of a majority of the outstanding shares, or
class of shares, entitled to vote on such action.

   McLeodUSA. Under the Delaware General Corporation Law, a corporation may
sell, lease or exchange all or substantially all of its property and assets if
authorized by a majority of the outstanding stock entitled to vote on the
disposition.

Preemptive Rights

   CapRock. Under the Texas Business Corporation Act, a stockholder has
preemptive rights, unless the articles of incorporation limit those rights. The
CapRock articles of incorporation expressly deny preemptive rights to any
holder of shares of any class of stock of CapRock, solely as a result of being
a stockholder. The CapRock articles of incorporation, however, reserve the
right of CapRock to grant preemptive rights by contract.

   McLeodUSA. Under the Delaware General Corporation Law, a stockholder does
not have preemptive rights unless the corporation's certificate of
incorporation specifically grants those rights. The McLeodUSA certificate of
incorporation does not grant preemptive rights.

Business Combination with an Interested Stockholder

   CapRock. Part 13 of the Texas Business Corporation Act generally prevents an
"affiliated" stockholder or its affiliates or associates from entering into or
engaging in a "business combination" with a public corporation during the
three-year period immediately following the affiliated stockholder's
acquisition of shares unless specific conditions are satisfied. This
prohibition does not apply to public corporations whose original articles of
incorporation contain a provision expressly electing not to be governed by this
Part 13. The original CapRock articles of incorporation expressly elect not to
be governed by Part 13 of the Texas Business Corporation Act.

   McLeodUSA. McLeodUSA is subject to the provisions of Section 203 of the
Delaware General Corporation Law as generally described above under "--Certain
Charter and Statutory Provisions--Section 203 of the Delaware General
Corporation Law."

Dissenters' Appraisal Rights

   CapRock. Under the Texas Business Corporation Act, a stockholder is entitled
to dissent from and obtain the appraised value of his or her shares in
connection with any plan of merger or exchange or disposition of all or
substantially all, of the corporation's assets if the Texas Business
Corporation Act requires a stockholder vote on the action.

   However, a stockholder does not have the right to dissent from any plan of
merger in which there is a single surviving or new corporation, or from any
plan of exchange, if (1) the shares held by the stockholder are

                                       94
<PAGE>

listed on a national securities exchange, listed on the Nasdaq Stock Market,
designated a national market security by the National Association of Securities
Dealers, Inc. or held of record by not less than 2,000 stockholders; (2) the
stockholder is not required by the terms of the plan of merger or the plan of
exchange to accept for his or her shares any consideration that is different
than the consideration to be provided to any other holder of shares of the same
class or series; and (3) the stockholder is not required by the terms of the
plan of merger or the plan of exchange to accept for his or her shares
consideration other than shares of a corporation which immediately after the
effective time of the merger will be listed on a national securities exchange,
approved for quotation as a national market security by the National
Association of Securities Dealers, Inc., held of record by not less than 2,000
stockholders, or cash in lieu of fractional shares the stockholder is otherwise
entitled to receive.

   McLeodUSA. Under the Delaware General Corporation Law, stockholders
generally have the right to demand and receive payment in cash for the fair
value of their stock in an appraisal proceeding in lieu of the consideration
stockholders would otherwise receive in a merger or consolidation if the terms
of the agreement of merger or consolidation require the stockholder to accept
in exchange for his shares anything other than shares of stock in the
corporation surviving or resulting from the merger or consolidation, shares of
any other corporation that at the effective date of the merger or consolidation
will be either listed on a national securities exchange or designated as a
national market system security by the National Association of Securities
Dealers, Inc., or held of record by more than 2,000 holders, cash in lieu of
fractional shares, or any combination thereof. A stockholder does not have
appraisal rights if the shares of the corporation are listed on a national
securities exchange or designated as a national market system security by the
National Association of Securities Dealers, Inc. or held of record by more than
2,000 holders, or if the corporation will be the surviving corporation of a
merger and the merger does not require the vote of the corporation's
stockholders.

   A Delaware corporation's certificate of incorporation may provide that
appraisal rights shall be available in the event of the sale of all or
substantially all of a corporation's assets or adoption of an amendment to its
certificate of incorporation. The McLeodUSA certificate of incorporation does
not provide for such rights.

Dividends

   CapRock. Under the Texas Business Corporation Act, the board of directors of
a corporation may authorize a corporation to make distributions only out of its
surplus (the excess of net assets over stated capital). Under the CapRock
articles of incorporation, the holders of shares of CapRock common stock are
entitled to receive cash dividends, when and if declared by the CapRock board
of directors, subject to the preferences of the CapRock preferred stock.

   McLeodUSA. Under the Delaware General Corporation Law, a corporation may pay
dividends out of surplus. If there is no surplus, dividends may be declared out
of net profits for the current or preceding fiscal year unless the capital of
the corporation has been decreased to an amount less than the aggregate amount
of the capital represented by the issued and outstanding stock having a
preference upon the distribution of assets. Under the McLeodUSA certificate of
incorporation, holders of shares of McLeodUSA Class A common stock are entitled
to receive dividends equally on each share, when and if declared by the
McLeodUSA board of directors out of assets legally available therefor, after
payment of all dividends to holders of shares of any class of stock having
preference over the Class A common stock.

Liquidation Rights

   CapRock. Under the Texas Business Corporation Act, a corporation liquidating
its assets must satisfy its debts and liabilities followed by distributions to
its stockholders, according to their respective rights and interests. The
CapRock articles of incorporation provide that upon liquidation, dissolution or
winding up of CapRock, after payment in full has been made to holders of any
series of preferred stock ranking senior to the CapRock common stock, the
holders of CapRock common stock are entitled to receive, pro rata, all of the
remaining assets and funds of CapRock.

                                       95
<PAGE>

   McLeodUSA. Under the Delaware General Corporation Law, a dissolved
corporation or successor entity must pay claims against the corporation,
followed by unpaid dividends to the holders of preferred stock before making
distributions to the holders of common stock. Under the McLeodUSA certificate
of incorporation, in the event of any dissolution, liquidation, or winding up
of McLeodUSA, the holders of McLeodUSA Class A common stock shall become
entitled to participate in the distribution of any assets of McLeodUSA
remaining after McLeodUSA has paid all debts and liabilities and the full
preferential amounts due to any class of McLeodUSA stock having preference over
McLeodUSA Class A common stock.

Indemnification of Directors and Officers

   CapRock. Under the Texas Business Corporation Act, a corporation is
permitted to provide indemnification or advancement of expenses against
judgments, penalties, fines, settlements and reasonable expenses actually
incurred by a person in connection with a proceeding resulting from that person
being or having been a director, officer or agent of the corporation only if
that person conducted himself in good faith; in the case of conduct in his
official capacity, he reasonably believed that his conduct was in the
corporation's best interests; in all other cases, he reasonably believed that
his conduct was at least not opposed to the corporation's best interests; and
in the case of any criminal proceeding, he had no reasonable cause to believe
his conduct was unlawful. If, however, the person is found liable to the
corporation or is found liable on the basis that he received improper personal
benefit, indemnification is limited to the reasonable expenses actually
incurred by the person in connection with the proceeding. Indemnification will
not be available if the person is found liable for willful or intentional
misconduct in the performance of his duty to the corporation.

   Under the Texas Business Corporation Act, any of the following can determine
whether indemnification is appropriate under Texas law: a majority vote of a
quorum consisting of directors who at the time of the vote are not party to the
proceeding; if such a quorum cannot be obtained, a majority vote of a special
committee of the board of directors consisting of at least two directors who at
the time of the vote are not party to the proceeding; special legal counsel; or
stockholder vote excluding shares held by directors party to the proceeding.

   Under the Texas Business Corporation Act a corporation must indemnify a
director if the director is wholly successful, on the merits or otherwise, in
the defense of the proceeding.

   The CapRock articles of incorporation and bylaws provide that CapRock will
indemnify and advance expenses to the maximum extent permitted by Texas law.
Under the Texas Business Corporation Act and the CapRock bylaws, CapRock may
purchase and maintain liability insurance or make other arrangements for such
director indemnification.

   McLeodUSA. McLeodUSA is subject to Section 145 of the Delaware General
Corporation Law pertaining to indemnification of officers and directors, as
generally described above under "--Limitation of Liability and
Indemnification."

Limitation of Personal Liability of Directors

   CapRock. Under the Texas Miscellaneous Corporation Laws Act, a corporation's
articles of incorporation may eliminate or limit all monetary liability of
directors to the corporation or its stockholders for conduct in the performance
of the director's duties. A corporation may not limit the liability of a
director for a breach of the director's duty of loyalty to the corporation or
its stockholders, an act or omission not in good faith, an act or omission that
involves intentional misconduct or a knowing violation of the law, obtaining an
improper personal benefit from the corporation, or violating applicable
statutes that expressly provide for the liability of a director. The CapRock
articles of incorporation eliminate the monetary liability of CapRock's
directors to the fullest extent permitted by law.

                                       96
<PAGE>

   McLeodUSA. McLeodUSA is subject to Section 102(b)(7) of the Delaware General
Corporation Law which authorizes corporations to limit or eliminate the
personal liability of directors to corporations and their stockholders for
monetary damages for breach of directors' fiduciary duty of care as generally
described above under "--Limitation of Liability and Indemnification."

Inspection of Books and Records

   CapRock. Under the Texas Business Corporation Act, any person who has been a
stockholder of record for at least six months preceding his demand, or who is
the holder of at least five percent of all of the outstanding shares of a
corporation, is entitled to examine the corporation's books and records for any
proper purpose.

   McLeodUSA. Under the Delaware General Corporation Law, any stockholder of a
Delaware corporation making a written demand may examine the corporation's
books and records for any proper purpose.

                                       97
<PAGE>

                                 LEGAL MATTERS

   The validity of the McLeodUSA Class A common stock offered in the merger
will be passed upon by Hogan & Hartson L.L.P., Washington, D.C.

   Federal income tax consequences relating to the merger will be passed upon
for CapRock by Munsch Hardt Kopf & Harr, P.C., Dallas, Texas.

                                    EXPERTS

   The consolidated financial statements and schedule of McLeodUSA and
subsidiaries as of December 31, 1999 and 1998, and for each of the three years
ended December 31, 1999, incorporated by reference in this registration
statement have been audited by Arthur Andersen LLP, independent public
accountants, as indicated in their reports with respect thereto, and are
incorporated by reference herein in reliance upon the authority of said firm as
experts in giving said reports.

   The consolidated financial statements of Splitrock Services, Inc. as of
December 31, 1999 and 1998, and for the period from March 5, 1997 (date of
inception) to December 31, 1997 and for each of the two years in the period
ended December 31, 1999, incorporated by reference in this registration
statement have been audited by Arthur Andersen LLP, independent public
accountants, as indicated in their report with respect thereto, and are
incorporated by reference herein in reliance upon the authority of said firm as
experts in giving said reports.

   The consolidated financial statements of CapRock Communications Corp. as of
December 31, 1998 and 1999 and for each of the years in the three-year period
ended December 31, 1999 are incorporated by reference in this registration
statement in reliance upon the report of KPMG LLP, independent certified public
accountants, incorporated by reference herein, and upon the authority of said
firm as experts in accounting and auditing.

                                 OTHER MATTERS

   As of the date of this proxy statement/prospectus, the CapRock board of
directors does not know of any matters that will be presented for consideration
at the special meeting other than as described in this proxy
statement/prospectus. However, the enclosed proxies will confer discretionary
authority on the individuals named as proxies to vote the shares represented by
the proxies as to any other matters that come before the special meeting and
are voted upon. The individuals named as proxies intend to vote in accordance
with their best judgment as to any other such matters.

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<PAGE>

                   SUBMISSION OF FUTURE STOCKHOLDER PROPOSALS

   CapRock will hold an annual meeting of its stockholders in the year 2001
only if the merger has not already been completed. If an annual meeting is
held, a proposal by a stockholder intended to be included in the proxy
statement and form of proxy related to the 2001 CapRock annual meeting of
stockholders must be received by CapRock no later than January 15, 2001,
pursuant to the proxy soliciting rules of the SEC.

   For any proposal that is not submitted for inclusion in next year's proxy
statement but is instead presented directly at the 2001 CapRock annual meeting
of stockholders, the CapRock management will be able to vote proxies in its
discretion if CapRock:

  .  receives notice of the proposal before the close of business on March
     31, 2001, and advises stockholders in the 2001 proxy statement about the
     nature of the matter and how the CapRock management intends to vote on
     such matter or

  .  does not receive notice of the proposal prior to the close of business
     on March 31, 2001

                      WHERE YOU CAN FIND MORE INFORMATION

   McLeodUSA has filed a registration statement with the SEC of which this
proxy statement/prospectus forms a part. The registration statement registers
the distribution to CapRock stockholders of the shares of McLeodUSA Class A
common stock to be issued in connection with the merger. The registration
statement, including the attached exhibits and schedules, contains additional
relevant information about McLeodUSA Class A common stock. The rules and
regulations of the SEC allow McLeodUSA to omit some of the information included
in the registration statement from this proxy statement/prospectus.

   In addition, both McLeodUSA and CapRock have filed reports, proxy statements
and other information with the SEC under the Securities Exchange Act. You may
read and copy any of this information at the following locations of the SEC:

  Public Reference Room    New York Regional Office    Chicago Regional Office
 450 Fifth Street, N.W.      7 World Trade Center          Citicorp Center
        Room 1024                 Suite 1300           500 West Madison Street
 Washington, D.C. 20549    New York, New York 10048          Suite 1400
                                                      Chicago, Illinois 60661-
                                                                2511

   You may obtain information on the operation of the SEC's Public Reference
Room by calling the SEC at 1-800-SEC-0330.

   The SEC also maintains an Internet Web site that contains reports, proxy
statements and other information regarding issuers, like McLeodUSA and CapRock,
that file electronically with the SEC. The address of that site is
http://www.sec.gov. The SEC file number for McLeodUSA's documents filed under
the Securities Exchange Act is 0-20763, and the SEC file number for CapRock's
documents filed under the Securities Exchange Act is 0-24581.

   The SEC allows McLeodUSA and CapRock to "incorporate by reference"
information into this proxy statement/prospectus. This means that McLeodUSA and
CapRock can disclose important information to you by referring you to another
document filed separately with the SEC. The information incorporated by
reference is considered to be a part of this proxy statement/prospectus, except
for any information that is superseded by information included directly in this
document.

   This proxy statement/prospectus incorporates by reference the documents
listed below that McLeodUSA and CapRock have previously filed or will file with
the SEC. They contain important information about McLeodUSA and CapRock and
their financial condition.

                                       99
<PAGE>

McLeodUSA SEC Filings (File No. 0-20763)

  .  Annual Report on Form 10-K for its fiscal year ended December 31, 1999,
     filed on March 30, 2000

  .  Quarterly Reports on Form 10-Q for the quarterly periods ended March 31,
     2000 and June 30, 2000, filed on May 15, 2000 and August 14, 2000,
     respectively

  .  Current Reports on Form 8-K filed on January 19, 2000, January 21, 2000,
     February 3, 2000, February 11, 2000, March 14, 2000, April 14, 2000, May
     24, 2000, June 1, 2000, October 13, 2000 and October 27, 2000, and the
     amended Current Report on Form 8-K/A filed on June 13, 2000

  .  All documents filed with the SEC by McLeodUSA under Sections 13(a),
     13(c), 14 and 15(d) of the Securities Exchange Act after the date of
     this proxy statement/prospectus and prior to the date of the special
     meeting are considered to be a part of this proxy statement/prospectus,
     effective the date such documents are filed

  .  The description of McLeodUSA Class A common stock set forth in the
     McLeodUSA registration statement filed under Section 12 of the
     Securities Exchange Act on Form 8-A on May 24, 1996, including any
     amendment or report filed with the SEC for the purpose of updating such
     description

  .  The consolidated financial statements of Splitrock Services, Inc. and
     subsidiary appearing on pages F-1 through F-18 of the Registration
     Statement on Form S-4 (Registration No. 333-48248) filed on October 19,
     2000

CapRock SEC Filings (File No. 0-24581)

  .  Annual Report on Form 10-K for its fiscal year ended December 31, 1999,
     filed on March 30, 2000

  .  Quarterly Reports on Form 10-Q for the quarterly periods ended March 31,
     2000 and June 30, 2000, filed on May 15, 2000 and August 14, 2000,
     respectively

  .  Current Reports on Form 8-K filed on April 20, 2000, July 10, 2000
     (two), August 3, 2000, August 16, 2000 and October 10, 2000
  .  All documents filed with the SEC by CapRock under Sections 13(a), 13(c),
     14 and 15(d) of the Securities Exchange Act after the date of this proxy
     statement/prospectus and prior to the date of the special meeting are
     considered to be a part of this proxy statement/prospectus, effective
     the date such documents are filed

  .  The description of CapRock common stock set forth in the CapRock
     registration statement filed under Section 12 of the Securities Exchange
     Act on Form 8-A on July 6, 1998, including any amendment or report filed
     with the SEC for the purpose of updating such description

   In the event of conflicting information in these documents, the information
in the latest filed document should be considered correct.

   You can obtain any of the documents listed above from the SEC, through the
SEC's Internet Web site at the address described above, or directly from
McLeodUSA or CapRock, by requesting them in writing or by telephone at the
following addresses:

         McLeodUSA Incorporated               CapRock Communications Corp.
       McLeodUSA Technology Park                 15601 Dallas Parkway,
    6400 C Street SW, P.O. Box 3177                    Suite 700
      Cedar Rapids, IA 52406-3177                   Dallas, TX 75001
         Attn: General Counsel               Attn: Chief Financial Officer
        Telephone (319) 790-7775                Telephone (972) 982-9550


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<PAGE>

   These documents are available from McLeodUSA and CapRock without charge,
excluding any exhibits to them unless the exhibit is specifically listed as an
exhibit to the registration statement of which this proxy statement/prospectus
forms a part. If you request any documents, McLeodUSA or CapRock will mail them
to you by first class mail, or another equally prompt means, within two
business days after your request is received. In order to ensure delivery of
the documents in advance of the special meeting, any request should be made at
least five business days prior to the date of the special meeting.

   This document is a prospectus of McLeodUSA and a proxy statement of CapRock
for the special meeting. McLeodUSA has supplied all information contained in,
or considered a part of, this proxy statement/prospectus relating to McLeodUSA,
and CapRock has supplied all information contained in, or considered a part of,
this proxy statement/prospectus relating to CapRock.

   Neither McLeodUSA nor CapRock has authorized anyone to give any information
or make any representation about the merger or McLeodUSA or CapRock that is
different from, or in addition to, that contained in this proxy
statement/prospectus or in any of the materials that McLeodUSA or CapRock has
incorporated into this document. Therefore, if anyone does give you information
of this sort, you should not rely on it. The information contained in this
document speaks only as of the date of this document unless the information
specifically indicates that another date applies.


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<PAGE>

                                                                      APPENDIX A

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


                          AGREEMENT AND PLAN OF MERGER

                          Dated as of October 2, 2000,

                                  By and Among

                            McLEODUSA INCORPORATED,

                            CACTUS ACQUISITION CORP.

                                      and

                          CAPROCK COMMUNICATIONS CORP.

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                          Page
                                                                          ----

                                   ARTICLE I

                                   The Merger

 <S>           <C>                                                        <C>
 Section 1.01. The Merger...............................................   A-1
 Section 1.02. Closing..................................................   A-1
 Section 1.03. Effective Time...........................................   A-2
 Section 1.04. Effects of the Merger....................................   A-2
 Section 1.05. Articles of Incorporation and By-laws....................   A-2
 Section 1.06. Board of Directors of the Surviving Corporation..........   A-2

                                   ARTICLE II

                Effect of the Merger on the Capital Stock of the
               Constituent Corporations; Exchange of Certificates

 Section 2.01. Effect on Capital Stock...................................  A-2
           (a) Capital Stock of Sub.....................................   A-2
           (b) Cancelation of Treasury Stock and Parent-Owned Stock.....   A-2
           (c) Conversion of Company Common Stock.......................   A-3
           (d) Anti-Dilution Provisions.................................   A-3
           (e) Options..................................................   A-3

 Section 2.02. Exchange of Certificates..................................  A-3
           (a) Exchange Agent...........................................   A-3
           (b) Exchange Procedure.......................................   A-3
           (c) Distributions with Respect to Unsurrendered
               Certificates.............................................   A-4
           (d) No Further Ownership Rights in Company Common Stock......   A-4
           (e) No Fractional Shares.....................................   A-4
           (f) Termination of Merger Consideration Obligation; No
               Liability................................................   A-4
           (g) Lost Certificates........................................   A-5
           (h) Withholding Rights.......................................   A-5

                                  ARTICLE III

                         Representations and Warranties

 Section 3.01. Representations and Warranties of the Company.............  A-5
           (a) Organization, Standing and Power.........................   A-5
           (b) Subsidiaries.............................................   A-6
           (c) Capital Structure........................................   A-6
           (d) Authority; Noncontravention..............................   A-7
           (e) SEC Documents; Undisclosed Liabilities...................   A-8
           (f) Information Supplied.....................................   A-9
           (g) Absence of Certain Changes or Events.....................   A-9
           (h) Litigation...............................................  A-10
           (i) Compliance with Applicable Laws..........................  A-10
           (j) Contracts................................................  A-11
           (k) Absence of Changes in Benefit Plans......................  A-11
           (l) ERISA Compliance.........................................  A-11
</TABLE>

                                       i
<PAGE>

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
 <C>           <S>                                                          <C>
           (m) Taxes......................................................  A-13
           (n) Voting Requirements........................................  A-14
           (o) State Takeover Statutes....................................  A-14
           (p) Brokers....................................................  A-14
           (q) Opinion of Financial Advisor...............................  A-14
           (r) Intellectual Property......................................  A-14

 Section 3.02. Representations and Warranties of Parent and Sub............ A-15
           (a) Organization, Standing and Power...........................  A-15
           (b) Capital Structure..........................................  A-15
           (c) Authority; Noncontravention................................  A-17
           (d) SEC Documents; Undisclosed Liabilities.....................  A-18
           (e) Information Supplied.......................................  A-18
           (f) No Material Adverse Change.................................  A-19
           (g) Litigation.................................................  A-19
           (h) Contracts..................................................  A-19
           (i) Voting Requirements........................................  A-19
           (j) State Takeover Statutes....................................  A-19
           (k) Brokers....................................................  A-19
           (l) Capitalization of Sub; No Prior Activities of Sub..........  A-19
           (m) Taxes......................................................  A-19

                                   ARTICLE IV

                   Covenants Relating to Conduct of Business

 Section 4.01. Conduct of Business......................................... A-19
           (a) Conduct of Business by the Company.........................  A-19
           (b) Other Actions..............................................  A-21
           (c) Certain Tax Matters........................................  A-22
           (d) Advice of Changes..........................................  A-22

 Section 4.02. No Solicitation............................................. A-22

                                   ARTICLE V

                             Additional Agreements

 Section 5.01. Preparation of the Form S-4 and the Proxy Statement........  A-24
 Section 5.02. Company Shareholders Meeting...............................  A-25
 Section 5.03. Access to Information; Confidentiality.....................  A-25
 Section 5.04. Commercially Reasonable Efforts............................  A-25
 Section 5.05. Company Stock Options......................................  A-26
 Section 5.06. Employee Benefit Plans; Existing Agreements................  A-26
 Section 5.07. Indemnification, Exculpation and Insurance.................  A-27
 Section 5.08. Fees and Expenses..........................................  A-27
 Section 5.09. Public Announcements.......................................  A-28
 Section 5.10. Affiliates.................................................  A-28
 Section 5.11. Nasdaq Quotation...........................................  A-28
 Section 5.12. Tax Treatment..............................................  A-28
 Section 5.13. Further Assurances.........................................  A-29
 Section 5.14. Transfer Taxes.............................................  A-29
</TABLE>

                                       ii
<PAGE>

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
 <C>           <S>                                                          <C>
 Section 5.15. Approvals..................................................  A-29
 Section 5.16. Consent of Noteholders.....................................  A-29
 Section 5.17. Notes Exchange Offer.......................................  A-30

                                   ARTICLE VI

                              Conditions Precedent

 Section 6.01. Conditions to Each Party's Obligation To Effect the Merger.. A-30
           (a) Shareholder Approval.......................................  A-30
           (b) HSR Act....................................................  A-30
           (c) Consents...................................................  A-30
           (d) No Restraints..............................................  A-30
           (e) Form S-4...................................................  A-30
           (f) Nasdaq Quotation...........................................  A-31

 Section 6.02. Conditions to Obligations of Parent and Sub................. A-31
           (a) Representations and Warranties.............................  A-31
           (b) Performance of Obligations of the Company..................  A-31
           (c) Consent Solicitation.......................................  A-31

 Section 6.03. Conditions to Obligations of the Company.................... A-31
           (a) Representations and Warranties.............................  A-31
           (b) Performance of Obligations of Parent and Sub...............  A-31
           (c) Tax Opinions...............................................  A-31
           (d) Financing Arrangements.....................................  A-31

 Section 6.04. Frustration of Closing Conditions........................... A-32

                                  ARTICLE VII

                       Termination, Amendment and Waiver

 Section 7.01. Termination................................................  A-32
 Section 7.02. Effect of Termination......................................  A-32
 Section 7.03. Amendment..................................................  A-33
 Section 7.04. Extension; Waiver..........................................  A-33

                                  ARTICLE VIII

                               General Provisions

 Section 8.01. Nonsurvival of Representations and Warranties..............  A-33
 Section 8.02. Notices....................................................  A-33
 Section 8.03. Definitions................................................  A-34
 Section 8.04. Interpretation.............................................  A-35
 Section 8.05. Counterparts...............................................  A-35
 Section 8.06. Entire Agreement; No Third-Party Beneficiaries.............  A-35
 Section 8.07. Governing Law..............................................  A-36
 Section 8.08. Assignment.................................................  A-36
 Section 8.09. Enforcement................................................  A-36
</TABLE>

                                      iii
<PAGE>

   AGREEMENT AND PLAN OF MERGER (this "Agreement") dated as of October 2, 2000,
among MCLEODUSA INCORPORATED, a Delaware corporation ("Parent"), CACTUS
ACQUISITION CORP., a Delaware corporation and a wholly owned subsidiary of
Parent ("Sub"), and CAPROCK COMMUNICATIONS CORP., a Texas corporation (the
"Company").

   WHEREAS the respective Boards of Directors of Parent, Sub and the Company
have approved and declared advisable this Agreement and the merger of Sub with
and into the Company (the "Merger"), upon the terms and subject to the
conditions set forth in this Agreement, whereby each issued and outstanding
share of common stock, par value $0.01 per share, of the Company (the "Company
Common Stock"), other than any such shares directly owned by Parent, Sub or the
Company, will be converted into the right to receive shares of Class A common
stock, par value $0.01 per share, of Parent (the "Parent Class A Common
Stock");

   WHEREAS for U.S. Federal income tax purposes, it is intended that (a) the
Merger will qualify as a "reorganization" within the meaning of Section 368(a)
of the Internal Revenue Code of 1986, as amended (the "Code"), and the rules
and regulations promulgated thereunder, (b) Parent, Sub and the Company will
each be a "party" to such reorganization within the meaning of Section 368(b)
of the Code and (c) this Agreement is intended to constitute a "plan of
reorganization" for U.S. Federal income tax purposes;

   WHEREAS pursuant to the aforementioned "plan of reorganization" the Company
and Parent will undertake the actions described in Sections 5.16 and 5.17 of
this Agreement;

   WHEREAS simultaneously with the execution and delivery of this Agreement and
as a condition and inducement to the willingness of Parent and Sub to enter
into this Agreement, Parent and certain shareholders of the Company are
entering into a voting agreement, certain shareholders of the Company are
entering into a voting agreement with Jere W. Thompson, Jr. and Parent and
certain shareholders of the Company are entering into a voting and option
agreement (collectively, the "Voting and Option Agreement") pursuant to which,
among other things, such shareholders have agreed to vote to approve this
Agreement and to take certain other actions in furtherance of the Merger upon
the terms and subject to the conditions set forth therein; and

   WHEREAS Parent, Sub and the Company desire to make certain representations,
warranties, covenants and agreements in connection with the Merger and also to
prescribe various conditions to the Merger.

   NOW, THEREFORE, in consideration of the representations, warranties,
covenants and agreements contained in this Agreement, the parties hereto agree
as follows:

                                   ARTICLE I

                                   The Merger

   Section 1.01. The Merger. Upon the terms and subject to the conditions set
forth in this Agreement, and in accordance with the General Corporation Law of
the State of Delaware (the "DGCL") and the Texas Business Corporation Act (the
"TBCA"), Sub shall be merged with and into the Company at the Effective Time.
At the Effective Time, the separate corporate existence of Sub shall cease and
the Company shall continue as the surviving corporation (the "Surviving
Corporation") and shall succeed to and assume all the rights and obligations of
Sub in accordance with the DGCL and the TBCA.

   Section 1.02. Closing. Upon the terms and subject to the conditions set
forth in this Agreement, the closing of the Merger (the "Closing") will take
place at 10:00 a.m. on the second Business Day after satisfaction or (to the
extent permitted by applicable law) waiver of the conditions set forth in
Article VI (other than those conditions that by their nature are to be
satisfied at the Closing, but subject to the satisfaction or waiver of those
conditions), at the offices of Cravath, Swaine & Moore, Worldwide Plaza, 825
Eighth Avenue, New York, New York 10019, unless another time, date or place is
agreed to by the parties hereto; provided, however, that if all the conditions
set forth in Article VI shall not have been satisfied or (to the extent
permitted

                                      A-1
<PAGE>

by applicable law) waived on such second Business Day, then the Closing will
take place on the first Business Day on which all such conditions shall have
been satisfied or (to the extent permitted by applicable law) waived. The date
on which the Closing occurs is referred to in this Agreement as the "Closing
Date".

   Section 1.03. Effective Time. Upon the terms and subject to the conditions
set forth in this Agreement, as soon as practicable on or after the Closing
Date, a certificate of merger, articles of merger or other appropriate
documents (in any such case, the "Certificate of Merger") shall be duly
prepared, executed and acknowledged by the parties in accordance with the
relevant provisions of the DGCL and the TBCA and filed with the Secretaries of
State of the State of Delaware and the State of Texas. The Merger shall become
effective at such time as the Certificate of Merger is duly filed with the
Secretary of State of the State of Delaware and the Secretary of State of the
State of Texas, or at such other time as Parent and the Company shall agree
and specify in the Certificate of Merger. The time the Merger becomes
effective is referred to in this Agreement as the "Effective Time".

   Section 1.04. Effects of the Merger. The Merger shall have the effects set
forth in Section 259 of the DGCL and Article 5.06 of the TBCA.

   Section 1.05. Articles of Incorporation and By-laws. (a) The Articles of
Incorporation of the Company, as in effect immediately prior to the Effective
Time, shall be the Articles of Incorporation of the Surviving Corporation
until thereafter changed or amended as provided therein or by applicable law;
provided, however, Article IV of such Articles of Incorporation shall be
amended at the Effective Time as set forth below:

     (i) Article IV of such Articles of Incorporation shall be amended to
  read in its entirety as follows:

                                  "ARTICLE IV

                                    Shares

   The aggregate number of shares which the Corporation shall have the
authority to issue is one thousand (1,000) shares of common stock, par value
of one cent ($.01) per share.".

     (b) The By-laws of the Company, as in effect immediately prior to the
  Effective Time, shall be the By-laws of the Surviving Corporation until
  thereafter changed or amended as provided therein or by applicable law.

   Section 1.06. Board of Directors of the Surviving Corporation. The
directors of Sub immediately prior to the Effective Time shall be the
directors of the Surviving Corporation, until the earlier of their death,
resignation or removal or until their respective successors are duly elected
and qualified, as the case may be.

                                  ARTICLE II

  Effect of the Merger on the Capital Stock of the Constituent Corporations;
                           Exchange of Certificates

   Section 2.01. Effect on Capital Stock. At the Effective Time, by virtue of
the Merger and without any action on the part of the holder of any shares of
capital stock of the Company, Parent or Sub:

     (a) Capital Stock of Sub. Each issued and outstanding share of capital
  stock of Sub shall be converted into a validly issued, fully paid and
  nonassessable share of common stock of the Surviving Corporation.

     (b) Cancelation of Treasury Stock and Parent-Owned Stock. Each share of
  Company Common Stock that is directly owned by the Company, Sub or Parent
  shall automatically be canceled and shall cease to exist, and no
  consideration shall be delivered in exchange therefor.

                                      A-2
<PAGE>

     (c) Conversion of Company Common Stock. Subject to Section 2.02(e), each
  share of Company Common Stock issued and outstanding immediately prior to
  the Effective Time (other than shares to be canceled in accordance with
  Section 2.01(b)) shall be converted into the right to receive 0.3876 (the
  "Exchange Ratio") fully paid and nonassessable shares of Parent Class A
  Common Stock (the "Merger Consideration"). At the Effective Time, all such
  shares of Company Common Stock shall no longer be outstanding and shall
  automatically be canceled and shall cease to exist, and each holder of a
  certificate that immediately prior to the Effective Time represented any
  such shares of Company Common Stock (a "Certificate") shall cease to have
  any rights with respect thereto, except the right to receive the Merger
  Consideration, certain dividends or other distributions in accordance with
  Section 2.02(c) and any cash in lieu of fractional shares of Parent Class A
  Common Stock to be issued or paid in consideration therefor upon surrender
  of such Certificate in accordance with Section 2.02(e), in each case
  without interest.

     (d) Anti-Dilution Provisions. In the event Parent changes (or
  establishes a record date for changing) the number of shares of Parent
  Class A Common Stock issued and outstanding prior to the Effective Time as
  a result of a stock split, stock dividend, recapitalization, subdivision,
  reclassification, combination, exchange of shares or similar transaction
  with respect to the outstanding Parent Class A Common Stock and the record
  date therefor shall be prior to the Effective Time, the Exchange Ratio
  shall be proportionately adjusted to reflect such stock split, stock
  dividend, recapitalization, subdivision, reclassification, combination,
  exchange of shares or similar transaction.

     (e) Options. The effect of the Merger on Company Stock Options is set
  forth in Section 5.05.

   Section 2.02. Exchange of Certificates. (a) Exchange Agent. Prior to the
Effective Time, Parent shall designate Wells Fargo, or another bank or trust
company having (or whose parent has) net capital of not less than
$1,000,000,000 and that is reasonably acceptable to Parent and the Company, to
act as exchange agent (the "Exchange Agent") for the payment of the Merger
Consideration and shall deposit with the Exchange Agent at the Effective Time,
for the benefit of the holders of the Certificates, for exchange in accordance
with this Article II, through the Exchange Agent, certificates representing
shares of Parent Class A Common Stock issuable pursuant to Section 2.01 upon
surrender of the Certificates. Parent shall make available to the Exchange
Agent from time to time as required after the Effective Time cash necessary to
pay dividends and other distributions in accordance with Section 2.02(c) and to
make payments in lieu of any fractional shares of Parent Class A Common Stock
in accordance with Section 2.02(e).

     (b) Exchange Procedure. As soon as reasonably practicable after the
  Effective Time, the Exchange Agent shall mail to each holder of record of a
  Certificate (i) a form of letter of transmittal (which shall specify that
  delivery shall be effected, and risk of loss and title to the Certificates
  held by such person shall pass, only upon proper delivery of the
  Certificates to the Exchange Agent and shall be in such form and have such
  other provisions as Parent may reasonably specify) and (ii) instructions
  for use in surrendering the Certificates in exchange for the Merger
  Consideration with respect thereto. Upon surrender of a Certificate for
  cancelation to the Exchange Agent, together with such letter of
  transmittal, duly completed and validly executed, and such other documents
  as may reasonably be required by the Exchange Agent pursuant to such letter
  of transmittal, the holder of such Certificate shall be entitled to receive
  promptly in exchange therefor (x) a certificate or certificates
  representing the number of whole shares of Parent Class A Common Stock that
  such holder has the right to receive pursuant to the provisions of this
  Article II, (y) certain dividends or other distributions in respect of such
  Parent Class A Common Stock pursuant to Section 2.02(c) and (z) cash in
  lieu of any fractional share of Parent Class A Common Stock in accordance
  with Section 2.02(e), and the Certificate so surrendered shall forthwith be
  canceled. In the event of a transfer of ownership of Company Common Stock
  that is not registered in the transfer records of the Company, a
  certificate representing the proper number of shares of Parent Class A
  Common Stock may be issued to a person other than the person in whose name
  the Certificate so surrendered is registered if such Certificate shall be
  properly endorsed or otherwise be in proper form for transfer and the
  person requesting such issuance shall pay any transfer or other taxes
  required by reason of the issuance of shares of Parent Class A Common Stock
  to a person other than the registered holder of

                                      A-3
<PAGE>

  such Certificate or establish to the reasonable satisfaction of Parent that
  such tax has been paid or is not applicable. Until surrendered as
  contemplated by this Section 2.02(b), each Certificate shall be deemed at
  any time after the Effective Time to represent only the right to receive
  upon such surrender the Merger Consideration that the holder thereof has
  the right to receive pursuant to the provisions of this Article II, certain
  dividends or other distributions in accordance with Section 2.02(c) and any
  cash in lieu of any fractional share of Parent Class A Common Stock in
  accordance with Section 2.02(e). No interest shall be paid or shall accrue
  on any cash payable upon surrender of any Certificate.

     (c) Distributions with Respect to Unsurrendered Certificates. No
  dividends or other distributions declared or made with respect to Parent
  Class A Common Stock with a record date after the Effective Time shall be
  paid to the holder of any unsurrendered Certificate with respect to the
  shares of Parent Class A Common Stock that such holder has the right to
  receive upon surrender of such Certificate and no cash payment in lieu of
  any fractional share of Parent Class A Common Stock shall be paid to any
  such holder pursuant to Section 2.02(e) until the holder of record of such
  Certificate shall surrender such Certificate in accordance with this
  Article II. Subject to the effect of applicable abandoned property, escheat
  or similar laws, following surrender of any such Certificate there shall be
  paid to the record holder of any certificate representing whole shares of
  Parent Class A Common Stock issued in exchange therefor, without interest,
  (i) promptly after the time of such surrender, the amount of dividends or
  other distributions with a record date after the Effective Time theretofore
  paid with respect to such whole shares of Parent Class A Common Stock and
  the amount of any cash in lieu of a fractional share of Parent Class A
  Common Stock to which such holder is entitled pursuant to Section 2.02(e)
  and (ii) at the appropriate payment date, the amount of dividends or other
  distributions with a record date after the Effective Time but prior to such
  surrender and with a payment date subsequent to such surrender payable with
  respect to such whole shares of Parent Class A Common Stock.

     (d) No Further Ownership Rights in Company Common Stock. All shares of
  Parent Class A Common Stock issued upon the surrender for exchange of the
  Certificates in accordance with the terms of this Article II (including any
  cash paid pursuant to this Article II) shall be deemed to have been issued
  (and paid) in full satisfaction of all rights pertaining to the shares of
  Company Common Stock previously represented by such Certificates. At the
  close of business on the day on which the Effective Time occurs, the stock
  transfer books of the Company shall be closed and there shall be no further
  registration of transfers on the stock transfer books of the Surviving
  Corporation of the shares of Company Common Stock that were outstanding
  immediately prior to the Effective Time. If, after the Effective Time,
  Certificates are presented to the Surviving Corporation or the Exchange
  Agent for transfer or any other reason, they shall be canceled and
  exchanged as provided in this Article II.

     (e) No Fractional Shares. (i) No certificates or scrip representing
  fractional shares of Parent Class A Common Stock shall be issued upon the
  surrender for exchange of the Certificates, no dividend or distribution of
  Parent shall relate to such fractional share interests and such fractional
  share interests shall not entitle the owner thereof to vote or to any
  rights of a shareholder of Parent.

       (ii) Notwithstanding any other provision of this Agreement, each
    holder of shares of Company Common Stock exchanged pursuant to the
    Merger who would otherwise have been entitled to receive a fraction of
    a share of Parent Class A Common Stock shall receive, in lieu thereof,
    cash (without interest) in an amount, less the amount of any
    withholding taxes that may be required thereon, equal to such
    fractional part of a share of Parent Class A Common Stock multiplied by
    the per share closing price of Parent Class A Common Stock on the
    Closing Date, as such price is quoted on The Nasdaq National Market
    ("Nasdaq"). For purposes of this Section 2.02(e), all fractional shares
    to which a single record holder of Company Common Stock would otherwise
    be entitled shall be aggregated and calculations shall be rounded to
    three decimal places.

     (f) Termination of Merger Consideration Obligation; No Liability. Any
  portion of the Merger Consideration which remains undistributed to the
  holders of Company Common Stock for one year after the Effective Time shall
  be delivered to Parent, upon demand. Any holders of Company Common Stock

                                      A-4
<PAGE>

  who have not theretofore complied with this Article II shall thereafter
  look only to Parent for the shares of Parent Class A Common Stock to which
  they are entitled pursuant to Section 2.01, any dividends or other
  distributions with respect to Parent Class A Common Stock to which they are
  entitled pursuant to Section 2.02(c) and any cash in lieu of fractional
  shares of Parent Class A Common Stock to which they are entitled pursuant
  to Section 2.02(e). None of Parent, Sub, the Company or the Exchange Agent
  shall be liable to any person in respect of any Merger Consideration, any
  dividends or distributions with respect thereto or any cash in lieu of
  fractional shares of Parent Class A Common Stock, in each case delivered to
  a public official pursuant to any applicable abandoned property, escheat or
  similar law. If any Certificate shall not have been surrendered prior to
  two years after the Effective Time (or immediately prior to such earlier
  date on which any Merger Consideration, any dividends or distributions
  payable to the holder of such Certificate or any cash payable in lieu of
  fractional shares of Parent Class A Common Stock pursuant to this Article
  II, would otherwise escheat to or become the property of any Governmental
  Entity), any such Merger Consideration, dividends or distributions in
  respect thereof or such cash shall, to the extent permitted by applicable
  law, become the property of Parent, free and clear of all claims or
  interest of any person previously entitled thereto.

     (g) Lost Certificates. If any Certificate shall have been lost, stolen
  or destroyed, upon the making of an affidavit of that fact by the person
  claiming such Certificate to be lost, stolen or destroyed and, if required
  by the Exchange Agent or Parent, the posting by such person of a bond in
  such reasonable amount as it may reasonably direct as indemnity against any
  claim that may be made against Parent, the Company or the Exchange Agent
  with respect to such Certificate, the Exchange Agent shall issue in
  exchange for such lost, stolen or destroyed Certificate the Merger
  Consideration, any unpaid dividends and distributions in respect thereof
  and any cash in lieu of fractional shares of Parent Class A Common Stock,
  in each case pursuant to this Agreement.

     (h) Withholding Rights. Parent, Sub or the Exchange Agent shall be
  entitled to deduct and withhold from the consideration otherwise payable
  pursuant to this Agreement to any holder of shares of Company Common Stock
  such amounts as Parent, Sub or the Exchange Agent is required to deduct and
  withhold with respect to the making of such payment under the Code, or any
  provision of state, local or foreign tax law. To the extent that amounts
  are so withheld and paid over to the appropriate taxing authority by
  Parent, Sub or the Exchange Agent, such withheld amounts shall be treated
  for all purposes of this Agreement as having been paid to the holder of the
  shares of Company Common Stock in respect of which such deduction and
  withholding was paid by Parent, Sub or the Exchange Agent.

                                  ARTICLE III

                         Representations and Warranties

   Section 3.01. Representations and Warranties of the Company. Except as
expressly set forth on the disclosure schedule (with specific reference to the
Section or Subsection of this Agreement to which the information stated in such
disclosure relates and such other Sections or Subsections to the extent a
matter is disclosed in such a way as to make its relevance to such other
Section or Subsection readily apparent) delivered by the Company to Parent
prior to the execution of this Agreement (the "Company Disclosure Schedule") or
the Company Filed SEC Documents, the Company represents and warrants to Parent
and Sub as follows:

     (a) Organization, Standing and Power. Each of the Company and its
  Subsidiaries is (i) duly organized, validly existing and in good standing
  under the laws of the jurisdiction in which it is organized, (ii) has the
  requisite corporate, company or partnership power and authority to carry on
  its business as now being conducted and (iii) is duly qualified or licensed
  to do business and is in good standing in each jurisdiction in which the
  nature of its business or the ownership, leasing or operation of its
  properties makes such qualification or licensing necessary, other than
  (except in the case of clauses (i) and (ii) above with respect to the
  Company) where the failure to be so organized, existing, qualified or
  licensed or in good standing individually or in the aggregate could not
  reasonably be expected to have a Material

                                      A-5
<PAGE>

  Adverse Effect on the Company. The Company has made available to Parent and
  its Representatives prior to the execution of this Agreement true and
  complete copies of its Articles of Incorporation and By-laws and the
  certificate of incorporation and by-laws (or similar organizational
  documents) of each Subsidiary of the Company, in each case as amended to
  the date of this Agreement. The Company has made available to Parent and
  its Representatives true and complete copies of the minutes of all meetings
  of the shareholders of the Company, the Board of Directors of the Company
  and each committee of the Board of Directors of the Company.

     (b) Subsidiaries. Section 3.01(b) of the Company Disclosure Schedule
  sets forth a true and complete list of all the Subsidiaries of the Company
  as of the date of this Agreement. All the outstanding shares of capital
  stock of, or other equity or voting interests in, each Subsidiary of the
  Company have been validly issued and are fully paid and nonassessable and
  are owned directly or indirectly by the Company, free and clear of all
  Liens and free of any restriction on the right to vote, sell or otherwise
  dispose of such capital stock or other equity or voting interests. Except
  for the capital stock of, or other equity or voting interests in, its
  Subsidiaries, the Company does not beneficially own directly or indirectly
  any capital stock or other equity or voting interest in any person.

     (c) Capital Structure. The authorized capital stock of the Company
  consists of 200,000,000 shares of Company Common Stock and 20,000,000
  shares of preferred stock, par value $0.01 per share (the "Company
  Preferred Stock"). As of the close of business on September 30, 2000, (i)
  38,729,536 shares of Company Common Stock (excluding shares held by the
  Company as treasury shares, but including 65,000 shares of restricted stock
  which the Company has requested that the Company's transfer agent issue,
  but which have not been issued as of the date hereof) were issued and
  outstanding, (ii) 30,314 shares of Company Common Stock were held by the
  Company as treasury shares, (iii) 400,000 shares of Company Common Stock
  were reserved for issuance under the 1998 Director Stock Option Plan and
  7,745,907 shares of Company Common Stock were reserved for issuance under
  the 1998 Equity Incentive Plan, which amount is calculated pursuant to the
  1998 Equity Incentive Plan and is equal to 20% of the shares of Company
  Common Stock issued and outstanding on October 1, 2000 (subject to
  adjustment as provided in the 1998 Equity Incentive Plan), provided,
  however, that in no event will more than 50,000,000 shares of Company
  Common Stock be reserved for issuance under the 1998 Equity Incentive Plan;
  of which 6,843,946 shares of Company Common Stock were subject to
  outstanding Company Stock Options (including 340,570 shares of Company
  Common Stock that are subject to Company Stock Options originally granted
  under the CapRock Telecommunications Nonqualified Stock Option Plan, the
  CapRock Services Employee Incentive Stock Option Plan, the CapRock Services
  1997 Stock Option Plan and the CapRock Services 1997 Director Stock Option
  Plan and which were assumed by the Company) and (iv) no shares of Company
  Preferred Stock were issued and outstanding or were held by the Company as
  treasury shares. The Company has delivered to Parent a true and complete
  list, as of the close of business on September 30, 2000, of all outstanding
  Company Stock Options, the number of shares of Company Common Stock subject
  to each such Company Stock Option, the grant dates and exercise prices of
  each such Company Stock Option, the vesting schedule of each Company Stock
  Option and the names of the holders thereof. Except as set forth above, as
  of the close of business on September 30, 2000, no shares of capital stock
  of, or other equity or voting interests in, the Company or options,
  warrants or other rights to acquire any such stock, securities or interests
  were issued, reserved for issuance or outstanding. During the period from
  September 30, 2000, to the date of this Agreement, (x) there have been no
  issuances by the Company or any of its Subsidiaries of shares of capital
  stock of, or other equity or voting interests in, the Company or any of its
  Subsidiaries other than issuances of shares of Company Common Stock
  pursuant to the exercise of Company Stock Options outstanding on such date
  as required by their terms as in effect on the date of this Agreement and
  (y) there have been no issuances by the Company or any of its Subsidiaries
  of options, warrants or other rights to acquire shares of capital stock of,
  or other equity or voting interests in, the Company or any of its
  Subsidiaries. There are no outstanding stock appreciation rights,
  performance units or rights (other than the Company Stock Options) to
  receive shares of Company Common Stock on a deferred basis or otherwise
  linked to the price of Company Common Stock granted under the Company Stock
  Plans or otherwise. All outstanding shares of capital stock of the Company
  are,

                                      A-6
<PAGE>

  and all shares that may be issued pursuant to the Company Stock Plans will
  be, when issued in accordance with the terms thereof, duly authorized,
  validly issued, fully paid and nonassessable and not subject to preemptive
  rights. There are no bonds, debentures, notes or other indebtedness of the
  Company or any of its Subsidiaries, and, except as set forth above, no
  securities or other instruments or obligations of the Company or any of its
  Subsidiaries, in each case having the right to vote (or convertible into,
  or exchangeable for, securities having the right to vote) on any matters on
  which shareholders of the Company or any of its Subsidiaries may vote,
  except for any Company Stock Options issued after the date hereof in
  accordance with Section 4.01. Except as set forth above or as otherwise
  contemplated herein, there are no Contracts to which the Company or any of
  its Subsidiaries is a party or by which the Company or any of its
  Subsidiaries is bound obligating the Company or any of its Subsidiaries to
  issue, deliver or sell, or cause to be issued, delivered or sold,
  additional shares of capital stock of, or other equity or voting interests
  in, or securities convertible into, or exchangeable or exercisable for,
  shares of capital stock of, or other equity or voting interests in, the
  Company or any of its Subsidiaries or obligating the Company or any of its
  Subsidiaries to issue, grant, extend or enter into any such security,
  option, warrant, call, right or Contract. As of the date of this Agreement,
  the issued and outstanding Subject Shares (as such term is defined in the
  Voting and Option Agreement) represent at least a majority of the shares of
  Company Common Stock on an outstanding basis. There are not outstanding
  contractual obligations of the Company or any of its Subsidiaries to (I)
  repurchase, redeem or otherwise acquire any shares of capital stock of, or
  other equity or voting interests in, the Company or any of its Subsidiaries
  or (II) vote or dispose of any shares of the capital stock of, or other
  equity or voting interests in, the Company or any of its Subsidiaries. As
  of the date of this Agreement, there are no irrevocable proxies and no
  voting agreements to which the Company is a party with respect to any
  shares of the capital stock of, or other equity or voting interests in, the
  Company or any of its Subsidiaries.

     (d) Authority; Noncontravention. The Company has the requisite corporate
  power and authority to execute and deliver this Agreement and, subject to
  receipt of the Company Shareholder Approval, to consummate the transactions
  contemplated hereby. The execution and delivery of this Agreement by the
  Company and the consummation by the Company of the transactions
  contemplated by this Agreement have been duly authorized by all necessary
  corporate action on the part of the Company and no other corporate
  proceedings on the part of the Company are necessary to approve this
  Agreement or to consummate the transactions contemplated hereby, subject to
  the receipt of the consent of the holders of the Notes referred to in
  Section 5.16 and, in the case of the consummation of the Merger, to receipt
  of the Company Shareholder Approval. This Agreement has been duly executed
  and delivered by the Company and constitutes the legal, valid and binding
  obligation of the Company, enforceable against the Company in accordance
  with its terms. The Board of Directors of the Company, at a meeting duly
  called and held at which all directors of the Company were present, duly
  and unanimously adopted resolutions (i) approving and declaring advisable
  this Agreement, the Merger and the other transactions contemplated hereby,
  (ii) declaring that it is in the best interests of the Company's
  shareholders that the Company enter into this Agreement and consummate the
  Merger on the terms and subject to the conditions set forth in this
  Agreement, (iii) directing that this Agreement be submitted to a vote at a
  meeting of the Company's shareholders and (iv) recommending that the
  Company's shareholders approve this Agreement. The execution and delivery
  of this Agreement do not, and the consummation of the transactions
  contemplated by this Agreement and the Voting and Option Agreement and
  compliance with the provisions hereof do not and will not conflict with, or
  result in any violation or breach of, or default (with or without notice or
  lapse of time, or both) under, or give rise to a right of, or result in,
  termination, cancelation or acceleration of any obligation or loss of a
  benefit under, or result in the creation of any Lien upon any of the
  properties or assets of the Company or any of its Subsidiaries under, or
  give rise to any increased, additional, accelerated or guaranteed rights or
  entitlements under, any provision of (A) the Articles of Incorporation or
  the By-laws of the Company or the comparable organizational documents of
  any of its Subsidiaries, (B) any loan or credit agreement, note, bond,
  debenture, mortgage, indenture, guarantee, lease or other contract,
  commitment, agreement, instrument, arrangement, understanding, obligation,
  undertaking, permit, concession, franchise, certificate, license or similar
  authorization, whether oral or written (each, including

                                      A-7
<PAGE>

  all amendments thereto, a "Contract"), applicable to the Company or any of
  its Subsidiaries or their respective properties or assets or (C) subject to
  the governmental filings and other matters referred to in the following
  sentence, any judgment, order, decree, statute, law, ordinance, rule or
  regulation applicable to the Company or any of its Subsidiaries or their
  respective properties, operations or assets, other than, in the case of
  clauses (B) and (C), any such conflicts, violations, breaches, defaults,
  rights, losses, Liens or entitlements that individually or in the aggregate
  could not reasonably be expected to have a Material Adverse Effect on the
  Company or prevent or materially delay the consummation of the Merger. No
  consent, approval, order or authorization of, action by or in respect of,
  or registration, declaration or filing with, any Federal, state, local or
  foreign government, any court, administrative, regulatory or other
  governmental agency, commission or authority or any non-governmental self-
  regulatory agency, commission or authority (each a "Governmental Entity")
  is required by or with respect to the Company or any of its Subsidiaries in
  connection with the execution and delivery of this Agreement by the
  Company, or the consummation by the Company of the Merger or the other
  transactions contemplated by this Agreement or the Voting and Option
  Agreement, except for (1) the filing of a premerger notification and report
  form by the Company under the Hart-Scott-Rodino Antitrust Improvements Act
  of 1976, as amended (the "HSR Act"); (2) the filing with the Securities and
  Exchange Commission (the "SEC") of (A) a proxy statement relating to the
  Company Shareholders Meeting (such proxy statement, as amended or
  supplemented from time to time, the "Proxy Statement"), and (B) such
  reports under Section 13(a), 13(d), 15(d) or 16(a) of the Securities
  Exchange Act of 1934, as amended (the "Exchange Act"), as may be required
  in connection with this Agreement, the Voting and Option Agreement and the
  transactions contemplated by this Agreement or the Voting and Option
  Agreement; (3) the filing of the Certificate of Merger with the Secretaries
  of State of the State of Delaware and the State of Texas and appropriate
  documents with the relevant authorities of other states in which the
  Company is qualified to do business; (4) filings with and approvals of the
  Federal Communications Commission (the "FCC") as required under the
  Communications Act of 1934, as amended (the "Communications Act"), and the
  rules and regulations promulgated thereunder; (5) filings with and
  approvals of any state public service commissions ("PUCs") or similar
  regulatory bodies as required by applicable statutes, laws, rules,
  ordinances and regulations; (6) filings with and approvals of the Federal
  Aviation Administration (the "FAA") as required by applicable statutes,
  laws, rules, ordinances and regulations; (7) filings with and approvals of
  foreign antitrust or communications regulatory authorities; and (8) such
  other consents, approvals, orders or authorizations the failure of which to
  be made or obtained individually or in the aggregate could not reasonably
  be expected to have a Material Adverse Effect on the Company or prevent or
  materially delay the consummation of the Merger.

     (e) SEC Documents; Undisclosed Liabilities. The Company (or its public
  predecessor) has filed all required reports, schedules, forms, statements
  and other documents (including exhibits and all other information
  incorporated therein) with the SEC since January 1, 1998 (collectively, the
  "Company SEC Documents"). No Subsidiary of the Company is required to file
  any report, schedule, form, statement or other document with the SEC. As of
  their respective dates, the Company SEC Documents complied in all material
  respects with the requirements of the Securities Act of 1933, as amended
  (the "Securities Act"), or the Exchange Act, as the case may be, and the
  rules and regulations of the SEC promulgated thereunder applicable to such
  Company SEC Documents, and none of the Company SEC Documents when filed
  contained any untrue statement of a material fact or omitted to state a
  material fact required to be stated therein or necessary in order to make
  the statements therein, in light of the circumstances under which they were
  made, not misleading. Except to the extent that information contained in
  any Company SEC Document has been revised or superseded by a later filed
  Company SEC Document, none of the Company SEC Documents contains any untrue
  statement of a material fact or omits to state any material fact required
  to be stated therein or necessary in order to make the statements therein,
  in light of the circumstances under which they were made, not misleading.
  The financial statements (including the related notes) included in the
  Company SEC Documents comply as to form, as of their respective dates of
  filing with the SEC, in all material respects with applicable accounting
  requirements and the published rules and regulations of the SEC with
  respect thereto (the "Accounting Rules"), have been prepared in accordance

                                      A-8
<PAGE>

  with generally accepted accounting principles ("GAAP") (except, in the case
  of unaudited statements, as permitted by the Accounting Rules) applied on a
  consistent basis during the periods involved (except as may be indicated in
  the related notes) and fairly present in all material respects the
  consolidated financial position of the Company and its consolidated
  Subsidiaries as of the dates thereof and the consolidated results of their
  operations and cash flows for the periods then ended (subject, in the case
  of unaudited statements, to normal recurring year-end audit adjustments).
  Neither the Company nor any of its Subsidiaries has any liabilities or
  obligations of any nature (whether accrued, absolute, contingent or
  otherwise) which individually or in the aggregate could reasonably be
  expected to have a Material Adverse Effect on the Company.

     (f) Information Supplied. None of the information supplied or to be
  supplied by the Company or any of its Subsidiaries specifically for
  inclusion or incorporation by reference in (i) the registration statement
  on Form S-4 to be filed with the SEC by Parent in connection with the
  issuance of Parent Class A Common Stock in the Merger (the "Form S-4")
  will, at the time the Form S-4 becomes effective under the Securities Act,
  contain any untrue statement of a material fact or omit to state any
  material fact required to be stated therein or necessary to make the
  statements therein, in light of the circumstances under which they are
  made, not misleading or (ii) the Proxy Statement will, at the date it is
  first mailed to the Company's shareholders or at the time of the Company
  Shareholders Meeting, contain any untrue statement of a material fact or
  omit to state any material fact required to be stated therein or necessary
  in order to make the statements therein, in light of the circumstances
  under which they are made, not misleading. The Proxy Statement will comply
  as to form in all material respects with the requirements of the Exchange
  Act and the rules and regulations thereunder. No representation or warranty
  is made by the Company with respect to statements made or incorporated by
  reference in the Proxy Statement or the Form S-4 based on information
  supplied by Parent or Sub specifically for inclusion or incorporation by
  reference in the Proxy Statement or the Form S-4, as the case may be.

     (g) Absence of Certain Changes or Events. Except as disclosed in the
  Company SEC Documents filed and publicly available prior to the date of
  this Agreement (as amended to the date of this Agreement, the "Company
  Filed SEC Documents"), since December 31, 1999, the Company and its
  Subsidiaries have conducted their businesses only in the usual and ordinary
  course consistent with past practice, and since such date there has not
  been (i) any Material Adverse Change in the Company, (ii) any declaration,
  setting aside or payment of any dividend or other distribution (whether in
  cash, stock, property or otherwise) with respect to any of the Company's or
  any of its Subsidiaries capital stock or any other equity interests or
  securities, except for dividends or other distributions declared, set aside
  or paid by a wholly owned Subsidiary of the Company to its parent, (iii)
  any purchase, redemption or other acquisition of any shares of capital
  stock or any other equity interests or securities of the Company (other
  than in connection with the cashless exercises of Company Stock Options) or
  any of its Subsidiaries or any rights, warrants, calls or options to
  acquire such shares or other equity interests or securities, (iv) any
  split, combination or reclassification of any of the Company's or any of
  its Subsidiaries' capital stock or other equity interests or securities or
  any issuance or the authorization of any issuance of any other securities
  in respect of, in lieu of or in substitution for shares of capital stock or
  other equity interests or securities of the Company or any of its
  Subsidiaries, (v) (A) any granting by the Company or any of its
  Subsidiaries to any current or former director, officer, employee or
  consultant of the Company or its Subsidiaries of any increase in
  compensation, bonus or other benefits or any granting of any type of
  compensation or benefits to an employee not previously receiving or
  entitled to receive such type of compensation or benefit, except for normal
  increases in cash compensation in the ordinary course of business
  consistent with past practice or as was required under any agreement or
  Company Benefit Plan in effect on December 31, 1999 and specifically
  identified on the Company Disclosure Schedule, (B) any granting by the
  Company or any of its Subsidiaries to any current or former director,
  officer, employee or consultant of any right to receive any severance or
  termination pay, or increases therein, other than in the ordinary course of
  business consistent with past practice and consistent with the Company's
  current severance plans in effect on the date hereof as specifically
  described in Section 3.01(g) of the Company Disclosure Schedule, or (C) any
  entry by the Company or any of its Subsidiaries into, or any amendments of,
  (I) any employment (other

                                      A-9
<PAGE>

  than at-will), deferred compensation, consulting, severance, termination or
  indemnification agreement or any other agreement, plan or policy with or
  involving any current or former director, officer, employee or consultant
  (collectively, the "Company Benefit Agreements") or (II) any Company
  Benefit Plan, or (D) any amendment to, or modification of, any Company
  Stock Option, (vi) any payment of any benefit or the grant or amendment of
  any award (including in respect of stock options, stock appreciation
  rights, performance units, restricted stock or other stock based or stock
  related awards or the removal or modification of any restrictions in any
  Company Benefit Agreement or Company Benefit Plan or any awards made
  thereunder) except as required to comply with any applicable law or any
  Company Benefit Agreement or Company Benefit Plan existing on December 31,
  1999 or as described on the list delivered pursuant to the third sentence
  of Section 3.01(c), (vii) any damage, destruction or loss, whether or not
  covered by insurance, that individually or in the aggregate could
  reasonably be expected to have a Material Adverse Effect on the Company,
  (viii) except insofar as may have been required by a change in GAAP or
  applicable law, any material change in financial or tax accounting methods,
  principles or practices by the Company or any of its Subsidiaries, (ix) any
  material tax election or any settlement or compromise of any material tax
  liability or refund or (x) any revaluation by the Company or any of its
  Subsidiaries of any of the material assets of the Company or any of its
  Subsidiaries.

     (h) Litigation. There is no suit, action, proceeding, claim, grievance
  or investigation pending or, to the Knowledge of the Company, threatened
  against or affecting the Company or any of its Subsidiaries that
  individually or in the aggregate could reasonably be expected to have a
  Material Adverse Effect on the Company nor is there any judgment, decree,
  injunction, rule or order of any Governmental Entity or arbitrator
  outstanding against the Company or any of its Subsidiaries that has had, or
  that could reasonably be expected to have, individually or in the
  aggregate, a Material Adverse Effect on the Company.

     (i) Compliance with Applicable Laws. (i) The Company and its
  Subsidiaries hold all permits, licenses, variances, exemptions, orders,
  registrations, certificates and approvals of all Governmental Entities
  which are required for them to own, lease or operate their assets and to
  carry on their businesses (the "Company Permits") except where the failure
  to hold such Company Permits individually or in the aggregate could not
  reasonably be expected to have a Material Adverse Effect on the Company.
  The Company and its Subsidiaries are in compliance in all respects with the
  terms of the Company Permits and all applicable statutes, laws, ordinances,
  rules and regulations except where the failure to so comply individually or
  in the aggregate could not reasonably be expected to have a Material
  Adverse Effect on the Company. Except for the Company Permits with the FCC
  and any PUCs, the Merger, in and of itself, would not cause the revocation
  or cancelation of any Company Permit, except for any cancelation or
  revocation that individually or in the aggregate could not reasonably be
  expected to have a Material Adverse Effect on the Company. As of the date
  hereof, Section 3.01(i) of the Company Disclosure Schedule sets forth a
  true and complete list of all Company Permits obtained from the FCC and any
  state PUC.

       (ii) Except as could not reasonably be expected to have individually
    or in the aggregate a Material Adverse Effect on the Company, the
    Company and its Subsidiaries are in compliance in all respects with all
    applicable Environmental Laws, and the Company and its Subsidiaries
    have, and are in compliance in all respects with, all permits required
    under any applicable Environmental Law for the conduct of their
    respective businesses except where the failure to so comply
    individually or in the aggregate could not reasonably be expected to
    have a Material Adverse Effect on the Company. Neither the Company nor
    any of its Subsidiaries has received any written communication which is
    still in effect from any Governmental Entity or person that alleges
    that the Company or any of its Subsidiaries is in violation of, or
    subject to liability under, any Environmental Law, that individually or
    in the aggregate could reasonably be expected to have a Material
    Adverse Effect on the Company. To the Knowledge of the Company, neither
    the Company nor any of its Subsidiaries has released, generated,
    treated, stored, disposed of or transported Hazardous Materials, or
    arranged for any such activities, in a manner that individually or in
    the aggregate could reasonably be expected to result in a material
    liability of the Company.

                                      A-10
<PAGE>

   "Environmental Laws" means all Federal, state and local laws (including
common law), regulations, rules, ordinances, codes, decrees, judgements and
orders, in each case relating to pollution, protection of the environment,
natural resources or human health and safety.

   "Hazardous Materials" means (i) any petroleum or petroleum byproducts, radon
gas, asbestos in any form that is or could become friable, urea formaldehyde
foam insulation and (ii) any chemical, material, substance or waste that is
regulated pursuant to any Environmental Law.

     (j) Contracts. Neither the Company nor any of its Subsidiaries is in
  violation or breach of or in default under (nor does there exist any
  condition that upon the passage of time or the giving of notice or both
  would cause such a violation or breach of or default under) any Contract to
  which it is a party or by which it or any of its properties or assets is
  bound, except for violations or defaults that individually or in the
  aggregate could not reasonably be expected to have a Material Adverse
  Effect on the Company. Since December 31, 1999 and prior to the date
  hereof, none of the Company or its Subsidiaries has entered into any
  Contract with any Affiliate of the Company that would have been required to
  be filed as an exhibit to the Company's Annual Report on Form 10-K for the
  fiscal year ended December 31, 1999, had the Company been a party to such
  Contract as of December 31, 1999. Neither the Company nor any of its
  Subsidiaries is a party to or bound by any non-competition agreement or any
  other similar agreement or obligation which purports to limit in any
  respect the manner in which, or the localities in which, all or any portion
  of the business of the Company or its Subsidiaries, is conducted (or of
  Parent following the Effective Time).

     (k) Absence of Changes in Benefit Plans. Since December 31, 1999, there
  has not been any adoption or material amendment of any bonus, pension,
  savings, profit sharing, deferred compensation, incentive compensation,
  stock ownership, stock purchase, stock option, stock appreciation, phantom
  stock, retirement, vacation, severance, disability, death benefit,
  hospitalization, medical, welfare benefit or other plan, arrangement or
  understanding (whether or not legally binding) providing compensation or
  benefits to any current or former director, officer, employee or consultant
  of the Company or any of its Subsidiaries (collectively, the "Company
  Benefit Plans"), or any material change in any actuarial or other
  assumption used to calculate funding obligations with respect to any
  Company Benefit Plan, or any material change in the manner in which
  contributions to the Company Benefit Plan are made or the basis on which
  such contributions are determined.

     (l) ERISA Compliance. (i) Section 3.01(l) of the Company Disclosure
  Schedule sets forth a true and complete list of all the Company Benefit
  Plans. With respect to the Company Benefit Plans, no liability has been
  incurred and to the Knowledge of the Company there exists no condition or
  circumstances in connection with which the Company or any of its
  Subsidiaries could be subject to any liability that individually or in the
  aggregate could reasonably be expected to have a Material Adverse Effect on
  the Company under the Employee Retirement Income Security Act of 1974, as
  amended ("ERISA"), the Code or any other applicable law.

       (ii) Each Company Benefit Plan has been administered in accordance
    with its terms, except for any failures so to administer any Company
    Benefit Plan that individually or in the aggregate could not reasonably
    be expected to have a Material Adverse Effect on the Company. The
    Company, its Subsidiaries and all the Company Benefit Plans are in
    compliance with the applicable provisions of ERISA, the Code and all
    other applicable laws and the terms of all applicable collective
    bargaining agreements, except for any failures to be in such compliance
    that individually or in the aggregate could not reasonably be expected
    to have a Material Adverse Effect on the Company.

       (iii) All Company Benefit Plans that are intended to be qualified
    under Section 401(a) of the Code have received favorable determination
    letters from the Internal Revenue Service with respect to "TRA" (as
    defined in Section 1 of Rev. Proc. 91-66 or 93-39), to the effect that
    such Company Benefit Plans are qualified and exempt from Federal income
    taxes under Sections 401(a) and 501(a), respectively, of the Code, and
    no such determination letter has been revoked nor, to the Knowledge of
    the Company, has revocation been threatened, nor has any such Company
    Benefit Plan been

                                      A-11
<PAGE>

    amended since the date of its most recent determination letter or
    application therefor in any respect that individually or in the
    aggregate could reasonably be expected to adversely affect its
    qualification. Except as individually or in the aggregate could not
    reasonably be expected to have a Material Adverse Effect on the
    Company, there is no pending or, to the Knowledge of the Company,
    threatened litigation relating to the Company Benefit Plans.

       (iv) Except as individually or in the aggregate could not reasonably
    be expected to have a Material Adverse Effect on the Company, none of
    the Company, any of its Subsidiaries or any person or entity that,
    together with the Company or any of its Subsidiaries, is treated as a
    single employer (a "Commonly Controlled Entity") under Section 414(b),
    (c), (m) or (o) of the Code, has maintained, contributed to or been
    obligated to contribute to any Company Benefit Plan that is subject to
    Title IV of ERISA with respect to which the Company or any Commonly
    Controlled Entity has unfunded liabilities based upon the assumptions
    utilized in the most recent audited financial statements of the Company
    included in the Company Filed SEC Documents under any Company Benefit
    Plan subject to ERISA. Neither the Company nor any of its Subsidiaries,
    nor to the Knowledge of the Company, any officer of the Company or any
    of its Subsidiaries or any of the Company Benefit Plans that are
    subject to ERISA, any trusts created thereunder or any trustee or
    administrator thereof, has engaged in a "prohibited transaction" (as
    such term is defined in Section 406 of ERISA or Section 4975 of the
    Code), other than those exempt transactions in respect of which the
    prohibitions of Section 4975(c) of the Code do not apply by reason of
    Section 4975(d) of the Code, or any other breach of fiduciary
    responsibility that could reasonably be expected to subject the
    Company, any of its Subsidiaries or any officer of the Company or any
    of its Subsidiaries to the tax or penalty on prohibited transactions
    imposed by such Section 4975 or to any liability under Section 502(i)
    or 502(1) of ERISA, except for any such tax, penalty or liability that
    individually or in the aggregate could not reasonably be expected to
    have a Material Adverse Effect on the Company. Except as individually
    or in the aggregate could not reasonably be expected to have a Material
    Adverse Effect on the Company, all contributions and premiums required
    to be made under the terms of any Company Benefit Plan as of the date
    hereof have been timely made or have been reflected on the most recent
    consolidated balance sheet filed or incorporated by reference in the
    Company Filed SEC Documents.

       (v) Except as individually or in the aggregate could not reasonably
    be expected to have a Material Adverse Effect on the Company, each
    Company Benefit Plan that is a welfare benefit plan, to the extent
    applicable, complies in all material respects with the applicable
    requirements of Section 4980B(f) of the Code.

       (vi) The Company and its Subsidiaries are in compliance with all
    Federal, state, local and foreign requirements regarding employment,
    except for any failures to comply that individually or in the aggregate
    could not reasonably be expected to have a Material Adverse Effect on
    the Company. Neither the Company nor any of its Subsidiaries is a party
    to any collective bargaining or other labor union contract applicable
    to persons employed by the Company or any of its Subsidiaries and as of
    the date of this Agreement no such collective bargaining agreement is
    being negotiated by the Company or any of its Subsidiaries. There is no
    labor dispute, strike or work stoppage against the Company or any of
    its Subsidiaries pending or, to the Knowledge of the Company,
    threatened, which may interfere with the respective business activities
    of the Company or any of its Subsidiaries, except where such dispute,
    strike or work stoppage individually or in the aggregate could not
    reasonably be expected to have a Material Adverse Effect on the
    Company. To the Knowledge of the Company, none of the Company, any of
    its Subsidiaries or any of their respective directors, officers,
    employees or representatives has committed any unfair labor practice in
    connection with the operation of the respective businesses of the
    Company or any of its Subsidiaries, and there is no action, charge or
    complaint against the Company or any of its Subsidiaries by the
    National Labor Relations Board or any comparable governmental agency
    pending or threatened in writing, in each case except where

                                      A-12
<PAGE>

    such practices, actions, charges or complaints, individually or in the
    aggregate could not reasonably be expected to have a Material Adverse
    Effect on the Company.

       (vii) (A) Except for the vesting of Company Stock Options (other
    than those granted pursuant to Section 4.01(a)(ii)) and restricted
    shares of Company Common Stock granted under the Company's 1998 Equity
    Incentive Plan as required pursuant to the terms thereof upon
    consummation of the Merger or the exercise of the option under the
    Voting and Option Agreement, no employee of the Company or its
    Subsidiaries will be entitled to any additional benefits or any
    acceleration of the time of payment or vesting of any benefits under
    any Company Benefit Plan or Company Benefit Agreement as a result of
    the transactions contemplated by this Agreement or the Voting and
    Option Agreement, (B) no amount payable, or economic benefit provided,
    by the Company or its Subsidiaries (including any acceleration of the
    time of payment or vesting of any benefit) could be considered an
    "excess parachute payment" under Section 280G of the Code and (C) no
    person is entitled to receive any additional payment from the Company
    or its Subsidiaries or any other person (a "Parachute Gross-Up
    Payment") in the event that the excise tax under Section 4999 of the
    Code is imposed on such person.

     (m) Taxes. (i) Each of the Company and its Subsidiaries has filed or has
  caused to be filed all tax returns and reports required to be filed by it
  and all such returns and reports are complete and correct, or requests for
  extensions to file such returns or reports have been timely filed, granted
  and have not expired, except to the extent that such failures to file, to
  be complete or correct or to have extensions granted that remain in effect
  individually or in the aggregate are not reasonably likely to have a
  Material Adverse Effect on the Company. The Company and each of its
  Subsidiaries has paid or caused to be paid (or the Company has paid on its
  behalf) all taxes shown as due on such returns and reports, and the most
  recent financial statements contained in the Company Filed SEC Documents
  reflect an adequate reserve for all taxes payable by the Company and its
  Subsidiaries (in addition to any reserve for deferred taxes established to
  reflect timing differences between book and tax items) for all taxable
  periods and portions thereof accrued through the date of such financial
  statements.

       (ii) No deficiencies for any taxes have been proposed, asserted or
    assessed in writing against the Company or any of its Subsidiaries or
    any Company Consolidated Group that are not adequately reserved for,
    except for deficiencies that individually or in the aggregate are not
    reasonably likely to have a Material Adverse Effect on the Company. All
    material assessments for taxes due with respect to completed and
    settled examinations or any concluded litigation have been fully paid.
    The Federal income tax returns of the Company and its Subsidiaries
    consolidated in such returns have been examined by the Internal Revenue
    Service or have closed by virtue of the applicable statute of
    limitations for all years through 1994. There is no currently effective
    agreement or other document extending, or having the effect of
    extending, the period of assessment or collection of any taxes.

       (iii) Neither the Company nor any of its Subsidiaries has taken or
    agreed to take any action or knows of any fact, agreement, plan or
    other circumstance that is reasonably likely to prevent the Merger from
    qualifying as a "reorganization" within the meaning of Section 368(a)
    of the Code.

       (iv) There are no material Liens for taxes (other than for taxes not
    yet due and payable) on the assets of the Company or any of its
    Subsidiaries.

       (v) No deduction of any amount that would otherwise be deductible
    with respect to tax periods ending on or before the Effective Time
    could be disallowed under Section 162(m) of the Code.

       (vi) Neither the Company nor any of its Subsidiaries has constituted
    either a "distributing corporation" or a "controlled corporation" in a
    distribution of stock qualifying for tax-free treatment under Section
    355 of the Code (x) in the two years prior to the date of this
    Agreement or (y) in a distribution which could otherwise constitute
    part of a "plan" or "series of related transactions" (within the
    meaning of Section 355(e) of the Code) in conjunction with the Merger.


                                      A-13
<PAGE>

       (vii) As used in this Agreement (1) "taxes" shall include all (x)
    Federal, state, local or foreign income, property, sales, excise, use
    and other taxes or similar governmental charges, including any
    interest, penalties or additions with respect thereto, (y) liability
    for the payment of any amounts of the type described in clause (x) as a
    result of being a member of an affiliated, consolidated, combined or
    unitary group, and (z) liability for the payment of any amounts as a
    result of being party to any tax sharing agreement or as a result of
    any express or implied obligation to indemnify any other person with
    respect to the payment of any amounts of the type described in clause
    (x) or (y) and (2) the "Company Consolidated Group" means any
    affiliated group within the meaning of Section 1504(a) of the Code, in
    which the Company (or any Subsidiary of the Company) is or has ever
    been a member.

     (n) Voting Requirements. The affirmative vote at the Company Shareholder
  Meeting or any adjournment or postponement thereof of the holders of a
  majority of the voting power of all outstanding shares of Company Common
  Stock in favor of approving this Agreement (the "Company Shareholder
  Approval") is the only vote of the holders of any class or series of the
  Company's capital stock necessary to approve or adopt this Agreement. No
  other approval of the shareholders of the Company is required with respect
  to this Agreement or the transactions contemplated hereby.

     (o) State Takeover Statutes. The Company has elected in its Articles of
  Incorporation not to be governed by Part Thirteen of the TBCA. To the
  Knowledge of the Company, no other state takeover statute is applicable to
  the Merger or the other transactions contemplated by this Agreement or the
  Voting and Option Agreement.

     (p) Brokers. No broker, investment banker, financial advisor or other
  person, other than Salomon Smith Barney, Inc., the fees, commissions and
  expenses of which will be paid by the Company, is entitled to any broker's,
  finder's, financial advisor's or other similar fee or commission, or the
  reimbursement of expenses, in connection with the transactions contemplated
  by this Agreement or the Voting and Option Agreement based upon
  arrangements made by or on behalf of the Company. The Company has furnished
  to Parent true and complete copies of all agreements under which any such
  fees, commissions or expenses are payable and all indemnification and other
  agreements related to the engagement of the persons to whom such fees,
  commissions or expenses are payable.

     (q) Opinion of Financial Advisor. The Company has received the opinion
  of Salomon Smith Barney, Inc., dated the date of this Agreement and in
  customary form, to the effect that, as of such date, the Exchange Ratio is
  fair from a financial point of view to the shareholders of the Company
  (other than Parent and its Affiliates), a signed copy of which has been or
  promptly will be delivered to Parent.

     (r) Intellectual Property. (i) The Company and its Subsidiaries own, or
  are validly licensed or otherwise have the right to use, all patents,
  patent rights, trademarks, trade secrets, trade names, service marks,
  copyrights, technology, know-how and other proprietary intellectual
  property rights and computer programs (collectively, the "Intellectual
  Property Rights") used in the business of the Company and its Subsidiaries,
  except for such Intellectual Property Rights the failure of which to own,
  license or otherwise have the right to use individually or in the aggregate
  could not reasonably be expected to have a Material Adverse Effect on the
  Company.

       (ii) Neither the Company nor any of its Subsidiaries has interfered
    with, infringed upon, misappropriated or otherwise come into conflict
    with any Intellectual Property Rights of any other person except for
    any such interference, infringement, misappropriation or other conflict
    that individually or in the aggregate could not reasonably be expected
    to have a Material Adverse Effect on the Company. Neither the Company
    nor any of its Subsidiaries has received any written charge, complaint,
    claim, demand or notice alleging any such interference, infringement,
    misappropriation or other conflict (including any claim that the
    Company or any such Subsidiary must license or refrain from using any
    Intellectual Property Rights or other proprietary information of any
    other person) which has not been settled or otherwise fully resolved.
    To the Company's Knowledge, no other

                                      A-14
<PAGE>

    person has interfered with, infringed upon, misappropriated or
    otherwise come into conflict with any Intellectual Property Rights of
    the Company or any of its Subsidiaries except for any such
    interference, infringement, misappropriation or other conflict that
    individually or in the aggregate could not reasonably be expected to
    have a Material Adverse Effect on the Company.

       (iii) As the business of the Company and its Subsidiaries is
    presently conducted and proposed to be conducted without giving effect
    to any change with respect thereto that may be made by Parent, to the
    Company's Knowledge, Parent's use after the Closing of the Intellectual
    Property Rights which are material to the conduct of the business of
    the Company and its Subsidiaries, taken as a whole, will not interfere
    with, infringe upon, misappropriate or otherwise come into conflict
    with the Intellectual Property Rights of any other person.

   Section 3.02. Representations and Warranties of Parent and Sub. Except as
expressly set forth on the disclosure schedule (with specific reference to the
Section or Subsection of this Agreement to which the information stated in such
disclosure relates and such other Sections or Subsections to the extent a
matter is disclosed in such a way as to make its relevance to such other
Section or Subsection readily apparent) delivered by Parent to the Company
prior to the execution of this Agreement (the "Parent Disclosure Schedule") or
the Parent Filed SEC Documents, Parent represents and warrants to the Company
as follows:

     (a) Organization, Standing and Power. Each of Parent and its
  Subsidiaries is (i) duly organized, validly existing and in good standing
  under the laws of the jurisdiction in which it is organized, (ii) has the
  requisite corporate, company or partnership power and authority to carry on
  its business as now being conducted and (iii) is duly qualified or licensed
  to do business and is in good standing in each jurisdiction in which the
  nature of its business or the ownership, leasing or operation of its
  properties makes such qualification or licensing necessary, other than
  (except in the case of clauses (i) and (ii) above with respect to Parent)
  where the failure to be so organized, existing, qualified or licensed or in
  good standing individually or in the aggregate could not reasonably be
  expected to have a Material Adverse Effect on Parent. Parent has made
  available to the Company and its Representatives prior to the execution of
  this Agreement true and complete copies of its Amended and Restated
  Certificate of Incorporation and Amended and Restated By-laws, in each case
  as amended to the date of this Agreement.

     (b) Capital Structure. (i) The authorized capital stock of Parent
  consists of 2,000,000,000 shares of Parent Class A Common Stock, 22,000,000
  shares of Class B common stock, par value $0.01 per share (the "Parent
  Class B Common Stock"), 2,000,000 shares of serial preferred stock, par
  value $0.01 per share (the "Parent Preferred Stock"), of which 1,150,000
  shares have been designated as 6.75% Series A Cumulative Convertible
  Preferred Stock (the "Parent Series A Preferred Stock"), 275,000 shares
  have been designated as Series B Cumulative Convertible Preferred Stock
  (the "Parent Series B Preferred Stock") and 125,000 shares have been
  designated as Series C Convertible Preferred Stock (the "Parent Series C
  Preferred Stock"), and 10,000,000 shares of Class II preferred stock, par
  value $0.001 per share (the "Parent Class II Preferred Stock"). As of the
  close of business on August 31, 2000, (i) 583,802,894 shares of Parent
  Class A Common Stock were issued and outstanding, (ii) no shares of Parent
  Class A Common Stock were held by Parent as treasury shares, (iii)
  29,659,181 shares of Parent Class A Common Stock were reserved for issuance
  upon the conversion of the Parent Series A Preferred Stock, (iv) 56,506,847
  shares of Parent Class A Common Stock were reserved for issuance upon the
  conversion of the Parent Series B Preferred Stock, (v) 25,684,930 shares of
  Parent Class A Common Stock were reserved for issuance upon the conversion
  of the Parent Series C Preferred Stock, (vi) 307,448 shares of Parent Class
  A Common Stock were reserved for issuance in connection with the
  acquisition by Parent of Dakota Telecommunications Group, Inc. on March 5,
  1999 (the "Dakota Acquisition Stock"), (vii) 240,000 shares of Parent Class
  A Common Stock were reserved for issuance pursuant to stock option
  agreements entered into in connection with the acquisition by Parent of the
  assets of Noverr Publishing, Inc. on June 16, 1999 (the "Noverr Options"),
  (viii) 1,473,216 shares of Parent Class A Common Stock were reserved for
  issuance pursuant to a Stock Option Agreement dated August 21, 1998 between
  Parent and QST Enterprises, Inc. (the "QST Options"), (ix) 59,358 shares of
  Parent Class A Common Stock

                                      A-15
<PAGE>

  were reserved for issuance pursuant to Stock Option Agreements dated
  December 29, 1998, between Parent and certain stockholders of Inlet, Inc.
  (the "Inlet Options"), (x) 229,029 shares of Parent Class A Common Stock
  were reserved for issuance in connection with the Stock Option Agreement
  dated January 28, 1998, between Parent and Diamond Partners Incorporated
  (the "Diamond Partners Options"), (xi) up to 267,826,074 shares of Parent
  Class A Common Stock were reserved for issuance pursuant to the 1992, 1993
  and 1995 Incentive Stock Option Plans, the 1996 Employee Stock Option Plan,
  the Directors' Stock Option Plan and other stock option grants (such plans
  and arrangements, collectively, the "Parent Stock Plans"), of which
  130,233,437 shares were subject to outstanding stock options or other
  rights to purchase or receive shares of Parent Class A Common Stock (such
  stock options or other rights, together with the Noverr Options, the QST
  Options, the Inlet Options and the Diamond Partners Options, the "Parent
  Stock Options"), (xii) 3,691,797 shares of Parent Class A Common Stock were
  reserved for issuance pursuant to the Employee Stock Purchase Plan (the
  "Parent ESPP"), (xiii) 4,696,856 shares of Parent Class A Common Stock were
  reserved for issuance pursuant to the 401(k) Profit Sharing Plan (the
  "Parent 401(k)"), (xiv) no shares of Parent Class B Common Stock were
  issued and outstanding or were held by Parent as treasury shares, (xv)
  7,804,128 shares of Parent Class B Common Stock were reserved for issuance
  pursuant to the grant of options to a significant non-employee stockholder
  (the "Parent Class B Options"), (xvi) 7,804,128 shares of Parent Class A
  Common Stock were reserved for issuance upon the conversion of the shares
  of Parent Class B Common Stock issued upon the exercise of the Parent Class
  B Options, (xvii) 1,149,580 shares of Parent Series A Preferred Stock were
  issued and outstanding, (xviii) 275,000 shares of Parent Series B Preferred
  Stock were issued and outstanding, (xix) 125,000 shares of Parent Series C
  Preferred Stock were issued and outstanding, (xx) no shares of Parent
  Series A Preferred Stock, Parent Series B Preferred Stock or Parent Series
  C Preferred Stock were held by Parent as treasury shares and (xxi) no
  shares of Parent Class II Preferred Stock were issued and outstanding or
  were held by Parent as treasury shares. Except as set forth above, as of
  the close of business on August 31, 2000, no shares of capital stock of, or
  other equity or voting interests in, Parent or options, warrants or other
  rights to acquire any such stock, securities or interests were issued,
  reserved for issuance or outstanding. During the period from August 31,
  2000, to the date of this Agreement, (x) there have been no issuances by
  Parent or any of its Subsidiaries of shares of capital stock of, or other
  equity or voting interests in, Parent other than issuances of shares of
  Parent Class A Common Stock pursuant to the exercise of Parent Stock
  Options outstanding on such date as required by their terms as in effect on
  the date of this Agreement or the issuance of the Dakota Acquisition Stock
  and (y) except for issuances of Parent Stock Options to employees in the
  ordinary course of business, there have been no issuances by Parent or any
  of its Subsidiaries of options, warrants or other rights to acquire shares
  of capital stock of, or other equity or voting interests in, Parent, other
  than rights that may have arisen under the Parent ESPP or the
  Parent 401(k). As of the date of this Agreement, there are no outstanding
  stock appreciation rights, performance units or rights (other than the
  Parent Stock Options, the Parent Class B Options and any rights that may
  have arisen under the Parent ESPP or the Parent 401(k) or in respect of the
  Dakota Acquisition Stock) to receive shares of Parent Class A Common Stock
  or Parent Class B Common Stock on a deferred basis or otherwise linked to
  the price of Parent Class A Common Stock granted under the Parent Stock
  Plans or otherwise. All outstanding shares of capital stock of Parent are,
  and all shares that may be issued pursuant to the Parent Stock Plans, the
  Parent ESPP, the Parent 401(k) or the Parent Class B Options or in
  connection with any acquisition described above for which shares have been
  reserved will be, when issued in accordance with the terms thereof, duly
  authorized, validly issued, fully paid and nonassessable and not subject to
  preemptive rights. As of the date of this Agreement, there are no bonds,
  debentures, notes or other indebtedness of Parent or any of its
  Subsidiaries, and, except as set forth above, no securities or other
  instruments or obligations of Parent or any of its Subsidiaries the value
  of which is in any way based upon or derived from any capital or voting
  stock of Parent, in each case having the right to vote (or convertible
  into, or exchangeable for, securities having the right to vote) on any
  matters on which stockholders of Parent or any of its Subsidiaries may
  vote, except for any Parent Stock Options issued after the date hereof.
  Except as set forth above or as otherwise contemplated herein, as of the
  date of this Agreement, there are no Contracts to which Parent or any of
  its Subsidiaries is a party or by which Parent or any of its Subsidiaries
  is bound obligating Parent or any of its Subsidiaries to issue, deliver or

                                      A-16
<PAGE>

  sell, or cause to be issued delivered or sold, additional shares of capital
  stock of, or other equity or voting interests in, or securities convertible
  into, or exchangeable or exercisable for, shares of capital stock of, or
  other equity or voting interests in, Parent or any of its Subsidiaries or
  obligating Parent or any of its Subsidiaries to issue, grant, extend or
  enter into any such security, option, warrant, call, right or Contract. As
  of the date of this Agreement, there are not outstanding contractual
  obligations of Parent or any of its Subsidiaries to (I) repurchase, redeem
  or otherwise acquire any shares of capital stock of, or other equity or
  voting interests in, Parent or any of its Subsidiaries or (II) vote or
  dispose of any shares of the capital stock of, or other equity or voting
  interests in, Parent or any of its Subsidiaries. As of the date of this
  Agreement, there are no irrevocable proxies and no voting agreements to
  which Parent is a party with respect to any shares of the capital stock of,
  or other equity or voting interests in, Parent or any of its Subsidiaries.

       (ii) Section 3.02(b)(ii) of the Parent Disclosure Schedule sets
    forth a true and complete list of each of Parent's Subsidiaries as of
    the date hereof. All the outstanding shares of capital stock of, or
    other equity or voting interests in, each Subsidiary of Parent have
    been validly issued and are fully paid and nonassessable and are owned
    directly or indirectly by Parent, free and clear of any Liens and free
    of any restriction on the right to vote, sell or otherwise dispose of
    such capital stock or other ownership interests. Except for the capital
    stock or other ownership interests of its Subsidiaries, as of the date
    hereof, Parent does not beneficially own directly or indirectly any
    material capital stock of, or other material equity or voting interest
    in, any person.

     (c) Authority; Noncontravention. Each of Parent and Sub has the
  requisite corporate power and authority to execute and deliver this
  Agreement and to consummate the transactions contemplated by this
  Agreement. The execution and delivery of this Agreement by Parent and Sub
  and the consummation by Parent and Sub of the transactions contemplated by
  this Agreement have been duly authorized by all necessary corporate action
  on the part of Parent and Sub, as applicable, and no other corporate
  proceedings on the part of Parent are necessary to approve this Agreement
  or to consummate the transactions contemplated hereby. This Agreement has
  been duly executed and delivered by Parent and Sub and constitutes the
  legal, valid and binding obligations of Parent and Sub, enforceable against
  Parent and Sub in accordance with its terms. The Board of Directors of
  Parent, at a meeting duly called and held at which all directors of Parent
  were present, duly and unanimously adopted resolutions approving and
  declaring advisable this Agreement, the Voting and Option Agreement, the
  Merger and other transactions contemplated hereby or thereby. The execution
  and delivery of this Agreement do not, and the consummation of the
  transactions contemplated by this Agreement and the Voting and Option
  Agreement and compliance with the provisions hereof and thereof do not and
  will not conflict with, or result in any violation or breach of, or default
  (with or without notice or lapse of time, or both) under, or give rise to a
  right of, or result in, termination, cancelation or acceleration of any
  obligation or loss of a benefit under, or result in the creation of any
  Lien upon any of the properties or assets of Parent or any of its
  Subsidiaries under, or give rise to any increased, additional, accelerated
  or guaranteed rights or entitlements under, any provision of (A) the
  Amended or Restated Certificate of Incorporation or the Amended and
  Restated By-laws of Parent or the comparable organizational documents of
  any of its Subsidiaries, (B) any Contract applicable to Parent or any of
  its Subsidiaries or their respective properties or assets or (C) subject to
  the governmental filings and other matters referred to in the following
  sentence, any judgment, order, decree, statute, law, ordinance, rule or
  regulation applicable to Parent or any of its Subsidiaries or their
  respective properties, operations or assets, other than, in the case of
  clauses (B) and (C), any such conflicts, violations, breaches, defaults,
  rights, losses, Liens or entitlements that individually or in the aggregate
  could not reasonably be expected to have a Material Adverse Effect on
  Parent or prevent or materially delay the consummation of the Merger. No
  consent, approval, order or authorization of, action by or in respect of,
  or registration, declaration or filing with, any Governmental Entity is
  required by or with respect to Parent or any of its Subsidiaries in
  connection with the execution and delivery of this Agreement by Parent and
  Sub or the consummation by Parent and Sub of the transactions contemplated
  by this Agreement or the Voting and Option Agreement, except for (1) the
  filing of a premerger notification and report form by Parent under the HSR
  Act; (2) the filing with the SEC of

                                      A-17
<PAGE>

  (A) the Proxy Statement and the Form S-4, and (B) such reports under
  Section 13(a), 13(d), 15(d) or 16(a) of the Exchange Act, as may be
  required in connection with this Agreement, the Voting and Option Agreement
  and the transactions contemplated by this Agreement or the Voting and
  Option Agreement; (3) the filing of the Certificate of Merger with the
  Secretaries of State of the State of Delaware and the State of Texas and
  appropriate documents with the relevant authorities of other states in
  which the Company is qualified to do business; (4) filings with and
  approvals of the FCC as required under the Communications Act, and the
  rules and regulations promulgated thereunder; (5) such filings with and
  approvals of Nasdaq to permit the shares of Parent Class A Common Stock
  that are to be issued in connection with the Merger to be quoted on Nasdaq;
  (6) filings with and approvals of any state PUCs or similar regulatory
  bodies as required by applicable statutes, laws, rules, ordinances and
  regulations; (7) filings with and approvals of the FAA as required by
  applicable statutes, laws, rules, ordinances and regulations; (8) filings
  with and approvals of any foreign antitrust or communications regulatory
  authorities; and (9) such other consents, approvals, orders or
  authorizations the failure of which to be made or obtained individually or
  in the aggregate could not reasonably be expected to have a Material
  Adverse Effect on Parent or prevent or materially delay the consummation of
  the Merger.

     (d) SEC Documents; Undisclosed Liabilities. Parent has filed all
  required reports, schedules, forms, statements and other documents
  (including exhibits and all other information incorporated therein) with
  the SEC since January 1, 1998 (collectively, "Parent SEC Documents"). No
  Subsidiary of Parent is required to file any report, schedule, form,
  statement or other document with the SEC. As of their respective dates,
  Parent SEC Documents complied in all material respects with the
  requirements of the Securities Act or the Exchange Act, as the case may be,
  and the rules and regulations of the SEC promulgated thereunder applicable
  to such Parent SEC Documents, and none of the Parent SEC Documents when
  filed contained any untrue statement of a material fact or omitted to state
  a material fact required to be stated therein or necessary in order to make
  the statements therein, in light of the circumstances under which they were
  made, not misleading. Except to the extent that information contained in
  any Parent SEC Document has been revised or superseded by a later filed
  Parent SEC Document, none of the Parent SEC Documents contains any untrue
  statement of a material fact or omits to state any material fact required
  to be stated therein or necessary in order to make the statements therein,
  in light of the circumstances under which they were made, not misleading.
  The financial statements (including the related notes) included in the
  Parent SEC Documents comply as to form, as of their respective dates of
  filing with the SEC, in all material respects with the Accounting Rules,
  have been prepared in accordance with GAAP (except, in the case of
  unaudited statements, as permitted by the Accounting Rules) applied on a
  consistent basis during the periods involved (except as may be indicated in
  the related notes) and fairly present in all material respects the
  consolidated financial position of Parent and its consolidated Subsidiaries
  as of the dates thereof and the consolidated results of their operations
  and cash flows for the periods then ended (subject, in the case of
  unaudited statements, to normal recurring year-end audit adjustments).
  Neither Parent nor any of its Subsidiaries has any liabilities or
  obligations of any nature (whether accrued, absolute, contingent or
  otherwise) which individually or in the aggregate could reasonably be
  expected to have a Material Adverse Effect on Parent.

     (e) Information Supplied. None of the information supplied or to be
  supplied by Parent or any of its Subsidiaries specifically for inclusion or
  incorporation by reference in (i) the Form S-4 will, at the time the Form
  S-4 becomes effective under the Securities Act, contain any untrue
  statement of a material fact or omit to state any material fact required to
  be stated therein or necessary to make the statements therein, in light of
  the circumstances under which they are made, not misleading or (ii) the
  Proxy Statement will, at the date it is first mailed to the Company's
  shareholders or at the time of the Company Shareholders Meeting, contain
  any untrue statement of a material fact or omit to state any material fact
  required to be stated therein or necessary in order to make the statements
  therein, in light of the circumstances under which they are made, not
  misleading. The Form S-4 will comply as to form in all material respects
  with the requirements of the Securities Act and the rules and regulations
  thereunder. No representation or warranty is made by Parent with respect to
  statements made or incorporated by reference in the Proxy

                                      A-18
<PAGE>

  Statement or the Form S-4 based on information supplied by the Company
  specifically for inclusion or incorporation by reference in the Proxy
  Statement or the Form S-4, as the case may be.

     (f) No Material Adverse Change. Except as disclosed in the Parent SEC
  Documents filed and publicly available prior to the date of this Agreement
  (as amended to the date of this Agreement, the "Parent Filed SEC
  Documents"), since December 31, 1999, Parent and its Subsidiaries have
  conducted their businesses only in the ordinary course consistent with past
  practice, and since such date there has not been any Material Adverse
  Change in Parent.

     (g) Litigation. There is no suit, action, proceeding, claim, grievance
  or investigation pending or, to the Knowledge of Parent, threatened against
  or affecting Parent or any of its Subsidiaries that individually or in the
  aggregate could reasonably be expected to have a Material Adverse Effect on
  Parent nor is there any judgment, decree, injunction, rule or order of any
  Governmental Entity or arbitrator outstanding against Parent or any of its
  Subsidiaries that has had, or that could reasonably be expected to have,
  individually or in the aggregate, a Material Adverse Effect on Parent.

     (h) Contracts. Neither Parent nor any of its Subsidiaries is in
  violation or breach of or in default under (nor does there exist any
  condition that upon the passage of time or the giving of notice or both
  would cause such a violation or breach of or default under) any Contract to
  which it is a party or by which it or any of its properties or assets is
  bound, except for violations or defaults that individually or in the
  aggregate could not reasonably be expected to have a Material Adverse
  Effect on Parent. Since December 31, 1999 and prior to the date hereof,
  none of Parent or its Subsidiaries has entered into any Contract with any
  Affiliate of Parent that would have been required to be filed as an exhibit
  to Parent's Annual Report on Form 10-K for the fiscal year ended December
  31, 1999, had Parent been a party to such Contract as of December 31, 1999.

     (i) Voting Requirements. No approval of the stockholders of Parent is
  required with respect to this Agreement or the transactions contemplated
  hereby.

     (j) State Takeover Statutes. Except as provided in Section 3.01(o), to
  the Knowledge of Parent, no other state takeover statute is applicable to
  the Merger or the other transactions contemplated by this Agreement or the
  Voting and Option Agreement.

     (k) Brokers. No broker, investment banker, financial advisor or other
  person, other than Goldman, Sachs & Co., the fees, commissions and expenses
  of which will be paid by Parent, is entitled to any broker's, finder's,
  financial advisor's or other similar fee or commission, or the
  reimbursement of expenses, in connection with the transactions contemplated
  by this Agreement or the Voting and Option Agreement based upon
  arrangements made by or on behalf of Parent.

     (l) Capitalization of Sub; No Prior Activities of Sub. Sub was formed
  solely for the purpose of engaging in the transactions contemplated hereby,
  has engaged in no other business activities and has conducted its
  operations only as contemplated hereby. The authorized capital stock of Sub
  consists of 1,000 shares of common stock, par value $0.01 per share, all of
  which are duly authorized, validly issued, fully paid and nonassessable and
  held of record by Parent.

     (m) Taxes. Neither Parent nor any of its Subsidiaries has taken or
  agreed to take any action or knows of any fact, agreement, plan or other
  circumstance that is reasonably likely to prevent the Merger from
  qualifying as a "reorganization" within the meaning of Section 368(a) of
  the Code.

                                   ARTICLE IV

                   Covenants Relating to Conduct of Business

   Section 4.01. Conduct of Business. (a) Conduct of Business by the
Company. Except as set forth in Section 4.01(a) of the Company Disclosure
Schedule, as otherwise expressly permitted by this Agreement or as consented to
in writing by Parent (which consent shall not be unreasonably withheld), during
the period from

                                      A-19
<PAGE>

the date of this Agreement to the Effective Time, the Company shall, and shall
cause its Subsidiaries to, carry on their respective businesses in the ordinary
course and comply with all applicable laws, rules and regulations and use its
commercially reasonable efforts to preserve their assets and technology and
their relationships with customers, suppliers, licensors, licensees,
distributors and others having business dealings with them. In addition,
without limiting the generality of the foregoing, during the period from the
date of this Agreement to the Effective Time, except as set forth in Section
4.01(a) of the Company Disclosure Schedule, as otherwise expressly permitted by
this Agreement or as consented to in writing by Parent (which consent shall not
be unreasonably withheld), the Company shall not, and shall not permit any of
its Subsidiaries to:

     (i) (x) declare, set aside or pay any dividends on, or make any other
  distributions (whether in cash, stock, property or otherwise) in respect
  of, any of its capital stock or other equity or voting interests or
  securities, except for dividends and distributions (including liquidating
  distributions) by a direct or indirect wholly owned Subsidiary of the
  Company to its parent, (y) split, combine or reclassify any of its capital
  stock or other equity or voting interests or securities or, other than as
  allowed in clause (ii) below, issue or authorize the issuance of any other
  securities in respect of, in lieu of or in substitution for shares of its
  capital stock or any other equity or voting interests or securities, or (z)
  purchase, redeem or otherwise acquire any shares of capital stock or other
  equity or voting interests or securities of the Company or any of its
  Subsidiaries or any rights, warrants, calls or options to acquire any such
  shares or other equity or voting interests or securities other than any
  purchase of Company Common Stock held for more than six months in
  connection with a cashless exercise of Company Stock Options;

     (ii) issue, deliver, sell, grant, pledge or otherwise encumber or
  subject to any Lien any shares of its capital stock, any other equity or
  voting interests or securities or any securities convertible into, or
  exchangeable for, or any rights, warrants, calls or options to acquire, any
  such shares, equity or voting interests or securities or convertible
  securities or any stock appreciation rights or other rights that are linked
  to the price of Company Common Stock, other than (x) the issuance of shares
  of Company Common Stock upon the exercise of the Company Stock Options
  outstanding as of the date hereof in accordance with their terms on the
  date hereof, (y) grants of Company Stock Options to existing employees
  (including executive officers) in amounts, to individuals and on terms as
  agreed by the Company and Parent or (z) grants of Company Stock Options to
  new employees who are not executive officers in the ordinary course of
  business, to the extent that the aggregate number of shares of Company
  Common Stock issuable under such grants (whether or not vested), does not
  exceed 350,000 in any calendar quarter on terms consistent with past
  practice (except that Company Stock Options granted pursuant to this clause
  (z) shall vest in equal annual amounts over a four-year period from the
  date of grant), except, in the case of clauses (y) and (z), that the
  vesting of such Company Stock Options shall not accelerate upon the
  consummation of the Merger;

     (iii) amend the Company's Articles of Incorporation or By-laws or the
  comparable organizational documents of any of its Subsidiaries;

     (iv) directly or indirectly acquire or agree to acquire by merging or
  consolidating with, or by purchasing the assets of, or by any other manner,
  any business or any person, other than purchases of raw materials or
  supplies in the ordinary course of business consistent with past practice;

     (v) directly or indirectly sell, lease, license, sell and leaseback,
  mortgage or otherwise encumber or subject to any Lien or otherwise dispose
  of any of its properties or assets other than (A) sales or licenses of
  services in the ordinary course of business consistent with past practice
  or (B) sales of any properties or assets of a direct or indirect wholly
  owned Subsidiary of the Company to the Company or another direct or
  indirect wholly owned Subsidiary of the Company;

     (vi) (A) incur any indebtedness for borrowed money or guarantee any such
  indebtedness of another person, issue or sell any debt securities or
  rights, warrants, calls or options to acquire any debt securities of the
  Company or any of its Subsidiaries, guarantee any debt securities of
  another person, enter into any "keep well" or other agreement to maintain
  any financial statement condition of another person or enter into any
  arrangement having the economic effect of any of the foregoing, other than
  (x) short-term

                                      A-20
<PAGE>

  borrowings incurred in the ordinary course of business consistent with past
  practice, (y) intercompany indebtedness between the Company and any of its
  wholly owned Subsidiaries or between such wholly owned Subsidiaries and (z)
  in connection with the Financing Arrangements, (B) make any loans, advances
  or capital contributions to, or investments in, any other person, other
  than employee advances in the ordinary course of business consistent with
  past practice, or (C) repay, redeem, repurchase or otherwise retire, or
  otherwise make any payment in respect of, any indebtedness for borrowed
  money or any debt securities, or any rights, warrants, calls or options to
  acquire any debt securities, other than as required by their terms as in
  effect on the date of this Agreement;

     (vii) make any capital expenditure or expenditures, other than cash
  payments for capital expenditures (excluding capitalized selling, general
  and administrative costs and capitalized interest) in amounts not to exceed
  in the aggregate $100,000,000 for the calendar quarter ending December 31,
  2000 and $80,000,000 for the calendar quarter ending March 31, 2001;

     (viii) (x) pay, discharge, satisfy or settle any material claims
  (including claims of shareholders), liabilities, obligations (whether
  absolute, accrued, asserted or unasserted, contingent or otherwise), or
  litigation (whether or not commenced prior to the date of this Agreement),
  other than the payment, discharge, satisfaction or settlement, in the
  ordinary course of business consistent with past practice or in accordance
  with its terms, of any liability reflected or reserved against in the most
  recent consolidated financial statements (or the related notes) of the
  Company included in the Company Filed SEC Documents (for amounts not in
  excess of the amount reflected on, or reserved against in, such financial
  statements) or incurred since the date of such financial statements or (y)
  waive the material benefits of, or agree to modify in any material manner,
  or terminate or fail to enforce, or consent to any material matter with
  respect to which its consent is required under, any confidentiality,
  standstill or similar agreement to which the Company or any of its
  Subsidiaries is a party or of which the Company or any of its Subsidiaries
  is a beneficiary;

     (ix) except as may be required to comply with applicable law, enter
  into, adopt, amend in any material respect or terminate any Company Benefit
  Plan, collective bargaining agreement or other union agreement or Company
  Benefit Agreement, or materially change any actuarial or other assumption
  used to calculate funding obligations with respect to any Company Benefit
  Plan, or change the manner in which contributions to any Company Benefit
  Plan are made or the basis on which such contributions are determined;

     (x) (A) except for normal increases in cash compensation in the ordinary
  course of business consistent with past practice that, in the aggregate, do
  not materially increase benefits or compensation expenses of the Company or
  its Subsidiaries or increases required by applicable law, increase the
  compensation, bonus or other benefits of any current or former director,
  officer, employee or consultant or pay any benefit or amount not required
  by a Company Benefit Agreement or Company Benefit Plan as in effect on the
  date of this Agreement to any such person, (B) take any action to fund or
  in any other way secure the payment of compensation or benefits under any
  Company Benefit Agreement or Company Benefit Plan or (C) take any action to
  accelerate the vesting or payment of any compensation or benefit under any
  Company Benefit Agreement or Company Benefit Plan other than the
  consummation of the Merger or the exercise of the option under the Voting
  and Option Agreement which will accelerate the vesting of Company Stock
  Options (other than those Company Stock Options granted pursuant to
  Section 4.01(a)(ii)) and restricted shares of Company Common Stock granted
  under the Company's 1998 Equity Incentive Plan as required pursuant to the
  terms thereof; or

     (xi) authorize, commit or agree to take, any of the foregoing actions.

   The Company designates Leo Cyr and Parent designates Blake Fisher as their
designees for operational issues between the date of this Agreement and the
Effective Time, in each case until a replacement is designated by the Company
or Parent.

     (b) Other Actions. Except as required by applicable law or as expressly
  permitted by this Agreement, the Company and Parent shall not, and shall
  not permit any of their respective Subsidiaries to,

                                      A-21
<PAGE>

  knowingly take any action that could reasonably be expected to, result in
  (i) any of the representations and warranties of such party set forth in
  this Agreement that are qualified as to materiality becoming untrue at the
  Effective Time, (ii) any of such representations and warranties that are
  not so qualified becoming untrue in any material respect at the Effective
  Time, or (iii) any of the conditions to the Merger set forth in Article VI
  not being satisfied.

     (c) Certain Tax Matters. During the period from the date of this
  Agreement to the Effective Time, the Company shall, and shall cause each of
  its Subsidiaries to, (i) timely file all material tax returns ("Post-
  Signing Returns") required to be filed by it (after taking into account any
  applicable extension); (ii) timely pay all material taxes due and payable
  in respect of such Post-Signing Returns that are so filed; (iii) accrue a
  reserve in its books and records and financial statements in accordance
  with past practice for all taxes payable by it for which no Post-Signing
  Return is due prior to the Effective Time; (iv) promptly notify Parent of
  any suit, claim, action, investigation, proceeding or audit (collectively,
  "Actions") pending against or with respect to the Company or any of its
  Subsidiaries in respect of any material tax and not settle or compromise
  any such Action without Parent's consent; (v) not make any material tax
  election without Parent's consent and (vi) cause any and all existing tax
  sharing agreements, tax indemnity obligations and similar agreements,
  arrangements and practices with respect to taxes to which the Company or
  any of its Subsidiaries is a party or by which the Company or any of its
  Subsidiaries is otherwise bound (other than any such agreements,
  arrangements or obligations solely among the Company and any of its
  Subsidiaries) to be terminated as of the Closing Date so that after such
  date neither the Company nor any of its Subsidiaries shall have any further
  rights or liabilities thereunder.

     (d) Advice of Changes. The Company and Parent shall promptly advise the
  other party orally and in writing to the extent it has Knowledge of (i) any
  representation or warranty made by it contained in this Agreement that is
  qualified as to materiality becoming untrue or inaccurate in any respect or
  any such representation or warranty that is not so qualified becoming
  untrue or inaccurate in any material respect or (ii) the failure of it to
  comply with or satisfy in any material respect any covenant, condition or
  agreement to be complied with or satisfied by it under this Agreement and
  (iii) any change or event that has had, or that could reasonably be
  expected to have, a Material Adverse Effect on such party or on the truth
  of their respective representations and warranties or the ability of the
  conditions set forth in Article VI to be satisfied; provided, however, that
  no such notification shall affect the representations, warranties,
  covenants or agreements of the parties (or remedies with respect thereto)
  or the conditions to the obligations of the parties under this Agreement.

   Section 4.02. No Solicitation. (a) From and after the date of this
Agreement, the Company shall not, nor shall it permit any of its Subsidiaries
to, nor shall it authorize or permit any of the directors, officers or
employees of the Company or any of its Subsidiaries or any investment banker,
financial advisor, attorney, accountant or other representative retained by it
or any of its Subsidiaries (collectively, the "Representatives") to, directly
or indirectly through another person, (i) solicit, initiate or encourage, or
take any other action designed to, or which reasonably could be expected to,
facilitate, any inquiries or the making of any proposal that constitutes a
Company Takeover Proposal or (ii) participate in any discussions or
negotiations regarding, or furnish to any person any information with respect
to, or otherwise cooperate in any way with, any Company Takeover Proposal.
Notwithstanding the foregoing, at any time prior to obtaining the Company
Shareholder Approval, in response to a bona fide written Company Takeover
Proposal that the Board of Directors of the Company determines in good faith
(after consultation with outside counsel and a financial advisor of nationally
recognized reputation) constitutes or is reasonably likely to lead to a Company
Superior Proposal, and which Company Takeover Proposal was unsolicited after
the date hereof and did not otherwise result from a breach of this Section
4.02, the Company may, to the extent its Board of Directors determines in good
faith (after consultation with outside counsel) that it is appropriate to do so
in order to comply with its fiduciary duties to the Company's shareholders
under applicable law, and after giving Parent notice of such Company Takeover
Proposal and determination of necessity, (x) furnish information with respect
to the Company and its Subsidiaries to the person making such Company Takeover
Proposal (and its Representatives) pursuant to a customary confidentiality
agreement, provided, that all such information is provided to Parent prior to
or

                                      A-22
<PAGE>

substantially concurrent with the time it is provided to such person, and (y)
participate in discussions or negotiations with the person making such Company
Takeover Proposal (and its Representatives) regarding such Company Takeover
Proposal.

   The term "Company Takeover Proposal" means any inquiry, proposal or offer
from any person relating to, or that is reasonably likely to lead to, any
direct or indirect acquisition or purchase, in one transaction or a series of
transactions, of a business that constitutes 20% or more of the revenues, net
income, EBITDA or the assets of the Company and its Subsidiaries, taken as a
whole, or 20% or more of the Company Common Stock or the capital stock of, or
any other equity or voting interests in, any Subsidiary of the Company, any
tender offer or exchange offer that if consummated would result in any person
beneficially owning 20% or more of the Company Common Stock or the capital
stock of, or any other equity or voting interests in, any Subsidiary of the
Company, or any merger, consolidation, business combination, recapitalization,
liquidation, dissolution, joint venture, binding share exchange or similar
transaction involving the Company or any of its Subsidiaries pursuant to which
any person or the shareholders of any person would own 20% or more of the
Company or any resulting parent company of the Company, other than the
transactions contemplated by this Agreement or the Voting and Option Agreement.

   The term "Company Superior Proposal" means any bona fide, binding written
offer not solicited by or on behalf of the Company or any of its Subsidiaries
made by any person that if consummated would result in such person (or its
shareholders) owning, directly or indirectly, more than 50% of the shares of
Company Common Stock then outstanding (or of the surviving entity in a merger
or the direct or indirect parent of the surviving entity in a merger) or all or
substantially all the assets of the Company and its Subsidiaries, taken as a
whole, and otherwise on terms that the Board of Directors of the Company
determines in good faith (after consultation with a financial advisor of
nationally recognized reputation), taking into account the person making the
offer, the legal, financial, regulatory and other aspects of the offer deemed
appropriate by the Board of Directors of the Company and any changes to the
terms of this Agreement proposed by Parent in response to such offer or
otherwise, to be reasonably likely to obtain any required approvals on a timely
basis and to be more favorable to the Company's shareholders from a financial
point of view than the Merger.

     (b) Neither the Board of Directors of the Company nor any committee
  thereof shall (or shall agree to resolve to) (i) (A) withdraw (or modify in
  a manner adverse to Parent), or propose to withdraw (or modify in a manner
  adverse to Parent), the recommendation or declaration of advisability by
  such Board of Directors or such committee thereof of this Agreement or the
  Merger or (B) recommend, or propose to recommend, the approval or adoption
  of any Company Takeover Proposal (any action described in this clause (i)
  being referred to herein as a "Company Adverse Recommendation Change"),
  (ii) adopt or approve, or propose publicly to adopt or approve, any Company
  Takeover Proposal or withdraw, or propose to withdraw, its approval of this
  Agreement or the Merger, or (iii) approve or recommend, or propose to
  approve or recommend, or cause or permit the Company or any of its
  Subsidiaries to enter into any letter of intent, agreement in principle,
  acquisition agreement, memorandum of understanding, merger agreement,
  option agreement, joint venture agreement, partnership agreement or other
  similar agreement (each, an "Acquisition Agreement") constituting or
  related to, or that is intended to or is reasonably likely to lead to, any
  Company Takeover Proposal (other than a confidentiality agreement referred
  to in Section 4.02(a)). Notwithstanding the foregoing, at any time prior to
  obtaining the Company Shareholder Approval, the Board of Directors of the
  Company may, in response to a Company Superior Proposal that was
  unsolicited after the date hereof and that did not otherwise result from a
  breach of this Section 4.02, make a Company Adverse Recommendation Change
  to the extent such Board of Directors determines in good faith (after
  consultation with outside counsel) that it is necessary to do so in order
  to comply with its fiduciary duties to the Company's shareholders under
  applicable law; provided, however, that no Company Adverse Recommendation
  Change may be made until after the third Business Day following Parent's
  receipt of written notice (a "Notice of Company Superior Proposal") from
  the Company advising Parent that the Board of Directors of the Company has
  received a Company Superior Proposal and intends to make a Company Adverse
  Recommendation Change and specifying the terms and conditions of such
  Company Superior Proposal (it being understood and agreed that any
  amendment to the price or any other

                                      A-23
<PAGE>

  material term of a Company Superior Proposal shall require a new Notice of
  Company Superior Proposal and new three Business Day period).

     (c) In addition to the obligations of the Company set forth in
  paragraphs (a) and (b) of this Section 4.02, the Company shall immediately
  advise Parent orally and in writing of any request for information or of
  any Company Takeover Proposal, or of any inquiry the Company reasonably
  believes could lead to a Company Takeover Proposal, the terms and
  conditions of such request, Company Takeover Proposal or inquiry and the
  identity of the person making such request, Company Takeover Proposal or
  inquiry. The Company will keep Parent informed on a prompt basis of the
  status and details (including amendments or changes or proposed amendments
  or changes) of any such request, Company Takeover Proposal or inquiry.

     (d) Nothing contained in this Section 4.02 shall prohibit the Company
  from taking and disclosing to its shareholders a position contemplated by
  Rule 14d-9 or 14e-2 promulgated under the Exchange Act or from making any
  disclosure to the Company's shareholders if, in the good faith judgment of
  the Board of Directors of the Company, after consultation with outside
  counsel, failure so to disclose would be inconsistent with its obligations
  under applicable law; provided, however, that, in no event shall the
  Company nor its Board of Directors nor any committee thereof take, agree or
  resolve to take any action prohibited by Section 4.02(b).

                                   ARTICLE V

                             Additional Agreements

   Section 5.01. Preparation of the Form S-4 and the Proxy Statement. (a) As
soon as practicable following the date of this Agreement, the Company and
Parent shall prepare and file with the SEC the Proxy Statement and the Company
and Parent shall prepare and Parent shall file with the SEC the Form S-4, in
which the Proxy Statement will be included as a prospectus. Each of the Company
and Parent shall use its commercially reasonable efforts to have the Form S-4
declared effective under the Securities Act as promptly as practicable after
such filing and keep the Form S-4 effective for so long as necessary to
complete the Merger. The Company will use its commercially reasonable efforts
to cause the Proxy Statement to be mailed to the Company's shareholders as
promptly as practicable after the Form S-4 is declared effective under the
Securities Act. Parent shall also take any action (other than qualifying to do
business in any jurisdiction in which it is not now so qualified or to file a
general consent to service of process) reasonably required to be taken under
any applicable state securities laws in connection with the issuance of Parent
Class A Common Stock in the Merger and the Company shall furnish all
information concerning the Company and the holders of capital stock of the
Company as may be reasonably requested in connection with any such action. No
filing of, or amendment or supplement to, or correspondence to the SEC or its
staff with respect to, the Form S-4 will be made by Parent, or the Proxy
Statement will be made by the Company, without providing the other party a
reasonable opportunity to review and comment thereon. Parent will advise the
Company, promptly after it receives notice thereof, of the time when the Form
S-4 has become effective or any supplement or amendment thereto has been filed,
the issuance of any stop order, the suspension of the qualification of the
Parent Class A Common Stock issuable in connection with the Merger for offering
or sale in any jurisdiction, or any request by the SEC for amendment of the
Form S-4 or the Proxy Statement or comments thereon and responses thereto or
requests by the SEC for additional information and will, as promptly as
practicable, provide to the Company copies of all correspondence and filings
with the SEC with respect to the Form S-4. The Company will advise Parent,
promptly after it receives notice thereof, of any request by the SEC for
amendment of the Proxy Statement or comments thereon and responses thereto or
requests by the SEC for additional information and will, as promptly as
practicable, provide to Parent copies of all correspondence and filings with
the SEC with respect to the Proxy Statement. If at any time prior to the
Effective Time any information relating to the Company or Parent, or any of
their respective Affiliates, directors or officers, should be discovered by the
Company or Parent which should be set forth in an amendment or supplement to
any of the Form S-4 or the Proxy Statement, so that any of such documents would
not include any misstatement of a material fact or omit

                                      A-24
<PAGE>

to state any material fact necessary to make the statements therein, in light
of the circumstances under which they were made, not misleading, the party that
discovers such information shall promptly notify the other parties hereto and
an appropriate amendment or supplement describing such information shall be
promptly filed with the SEC and, to the extent required by law, disseminated to
the shareholders of Parent and the shareholders of the Company. For purposes of
Sections 3.01(f), 3.02(e) and 5.01, information concerning or related to
Parent, Sub or any of Parent's other Subsidiaries will be deemed to have been
provided by Parent, and information concerning or related to the Company, its
Subsidiaries or the Company Shareholders Meeting will be deemed to have been
provided by the Company.

   Section 5.02. Company Shareholders Meeting. The Company (i) shall, as soon
as practicable following the date of this Agreement, establish a record date
(which shall be as soon as practicable following the date of this Agreement)
for, duly call, give notice of, convene and hold a meeting of its shareholders
(the "Company Shareholders Meeting") for the purpose of obtaining the Company
Shareholder Approval and (ii) except as provided in Section 4.02(b), shall,
through its Board of Directors, recommend to its shareholders the approval of
this Agreement. The Company agrees that its obligations pursuant to clause (i)
of the first sentence of this Section 5.02 shall not be affected by the
commencement, public proposal, public disclosure or communication to the
Company of any Company Takeover Proposal, and such obligations shall not be
affected by any action that the Company takes under Section 4.02(b).

   Section 5.03. Access to Information; Confidentiality. Subject to the
existing confidentiality agreements between Parent and the Company
(collectively, the "Confidentiality Agreement"), upon reasonable notice, each
of Parent and the Company shall, and shall cause each of its Subsidiaries to,
afford to the other party and to the Representatives of such other party,
reasonable access during normal business hours during the period prior to the
Effective Time to all their respective properties, books, Contracts, personnel
and records and, during such period, each of the Company and Parent shall, and
shall cause each of its Subsidiaries to, furnish promptly to the other party
all other information concerning its business, properties and personnel as such
other party may reasonably request. Neither Parent nor the Company shall be
required to provide access to or disclose information where such access or
disclosure would contravene any applicable law, rule, regulation, order or
decree or would, with respect to any pending matter, result in a waiver of the
attorney-client privilege or the protection afforded attorney work-product.
Parent and the Company shall use their respective commercially reasonable
efforts to obtain from third parties any consents or waivers of confidentiality
restrictions with respect to any such information being provided by it. No
review pursuant to this Section 5.03 shall have an effect for the purpose of
determining the accuracy of any representation or warranty given by either
party hereto to the other party hereto. Each of the Company and Parent will
hold, and will direct its Representatives and Affiliates to hold, any nonpublic
information in accordance with the terms of the Confidentiality Agreement.

   Section 5.04. Commercially Reasonable Efforts. (a) Upon the terms and
subject to the conditions set forth in this Agreement, each of the parties
agrees to use its commercially reasonable efforts to take, or cause to be
taken, all actions, and to do, or cause to be done, and to assist and cooperate
with the other parties in doing, all things necessary, proper or advisable to
consummate and make effective, in the most expeditious manner practicable, the
Merger and the other transactions contemplated by this Agreement and the Voting
and Option Agreement, including using commercially reasonable efforts to
accomplish the following: (i) the taking of all reasonable acts necessary to
cause the conditions to Closing to be satisfied as promptly as practicable,
(ii) the obtaining of all necessary actions or nonactions, waivers, consents
and approvals from Governmental Entities and the making of all necessary
registrations and filings (including filings with Governmental Entities, if
any) and the taking of all reasonable steps as may be necessary to obtain an
approval or waiver from, or to avoid an action or proceeding by, any
Governmental Entity, (iii) the obtaining of all necessary consents, approvals
or waivers from third parties, (iv) the defending of any lawsuits or other
legal proceedings, whether judicial or administrative, challenging this
Agreement and the Voting and Option Agreement or the consummation of the Merger
or the other transactions contemplated hereby or thereby, including seeking to
have any stay or temporary restraining order entered by any court or other
Governmental Entity vacated or

                                      A-25
<PAGE>

reversed and (v) the execution and delivery of any additional instruments
necessary to consummate the Merger and the other transactions contemplated by,
and to fully carry out the purposes of, this Agreement and the Voting and
Option Agreement. Nothing in this Agreement shall be deemed to require Parent
to agree to, or proffer to, divest or hold separate any assets or any portion
of any business of Parent, the Company or any of their respective Subsidiaries
if the Board of Directors of Parent determines that so doing would materially
impair the benefits intended to be obtained by Parent in the Merger. Without
limiting the generality of the foregoing, the Company and Parent shall each
cooperate with the other in the defense of any litigation against Parent or the
Company and/or its directors relating to the transactions contemplated by this
Agreement or the Voting and Option Agreement.

     (b) In connection with and without limiting the foregoing, the Company
  and its Board of Directors and Parent and its Board of Directors shall use
  their respective commercially reasonable efforts to (1) take all action
  necessary to ensure that no state takeover statute or similar statute or
  regulation is or becomes applicable to this Agreement, the Voting and
  Option Agreement, the Merger or any of the other transactions contemplated
  by this Agreement or the Voting and Option Agreement and (2) if any state
  takeover statute or similar statute or, rule or regulation becomes
  applicable to this Agreement, the Voting and Option Agreement, the Merger
  or any other transactions contemplated by this Agreement or the Voting and
  Option Agreement, take all action necessary to ensure that the Merger and
  the other transactions contemplated by this Agreement or the Voting and
  Option Agreement may be consummated as promptly as practicable on the terms
  contemplated by this Agreement or the Voting and Option Agreement and
  otherwise to minimize the effect of such statute, rule or regulation on
  this Agreement, the Voting and Option Agreement, the Merger and the other
  transactions contemplated by this Agreement or the Voting and Option
  Agreement.

   Section 5.05. Company Stock Options. (a) At or as soon as practicable after
the Effective Time, the Company and Parent will take such steps as are
necessary to implement the arrangements provided in Section 5.05 of the Company
Disclosure Schedule.

     (b) The arrangements referenced in paragraph (a) above with respect to
  any Company Stock Options to which Section 421(a) of the Code applies shall
  be and are intended to be effected in a manner which is consistent with
  Section 424(a) of the Code.

     (c) At or prior to the Effective Time, Parent shall take all action
  necessary to authorize and reserve for issuance a sufficient number of
  shares of Parent Class A Common Stock issuable in respect of the Company
  Stock Options adjusted as described in paragraph (a) above. As soon as
  reasonably practicable following the Effective Time, Parent shall cause a
  number of shares of Parent Class A Common Stock equal to the number of
  shares issuable in respect of the Company Stock Options adjusted as
  described in paragraph (a) above to be registered under the Securities Act
  pursuant to a registration statement on Form S-8 (or another appropriate
  form). Such registration statement shall be kept effective (and the current
  status of the prospectus or prospectuses required thereby shall be
  maintained) for so long as any such options may remain outstanding.

   Section 5.06. Employee Benefit Plans; Existing Agreements. (a) During the
six-month period following the Effective Time (the "Transition Period"), Parent
shall cause the Surviving Corporation (i) to maintain the Company Benefit Plans
(other than equity-based arrangements) in effect on the date of this Agreement
or (ii) to replace all or any of the Company Benefit Plans with employee
benefit plans and programs maintained for similarly situated employees of
Parent, provided that the aggregate level of benefits (other than equity-based
arrangements) shall be substantially comparable to the aggregate level of
benefits provided by the Company Benefit Plans in effect on the date of this
Agreement.

     (b) To the extent that any plan of Parent or any of its Affiliates (a
  "Parent Plan") becomes applicable to any employee or former employee of the
  Company or its Subsidiaries, Parent shall grant, or cause to be granted, to
  such employees or former employees credit for their service with the
  Company and its Subsidiaries (and any of their predecessors) for the
  purpose of determining eligibility to participate and

                                      A-26
<PAGE>

  nonforfeitability of benefits under such Parent Plan and for purposes of
  benefit accrual under vacation and severance pay plans (but only to the
  extent such service was credited under similar plans of the Company and its
  Subsidiaries).

     (c) Parent shall cause the Company or the Surviving Corporation, as
  applicable, to honor in accordance with their respective terms (as in
  effect on the date of this Agreement), the Company Benefit Agreements
  disclosed on the Company Disclosure Schedule.

     (d) Subject to compliance by Parent with its obligations under Sections
  5.06(a), (b) and (c), nothing contained in this Section 5.06 or elsewhere
  in this Agreement shall be construed to prevent the termination of
  employment of any individual employee of the Company or its Subsidiaries or
  any change in the employee benefits available to any such individual
  employee or the amendment or termination of any particular Company Benefit
  Plan to the extent permitted by its terms as in effect immediately prior to
  the Effective Time.

   Section 5.07. Indemnification, Exculpation and Insurance. (a) Parent and Sub
agree that all rights to indemnification and exculpation from liabilities for
acts or omissions occurring at or prior to the Effective Time (and rights for
advancement of expenses) now existing in favor of the current or former
directors or officers, employees or agents of the Company and its Subsidiaries
as provided in their respective articles or certificates of incorporation or
by-laws (or comparable organizational documents) and any indemnification or
other similar agreements of the Company as in effect on the date hereof shall
be assumed by the Surviving Corporation in A-the Merger, without further
action, as of the Effective Time and shall survive the Merger and shall
continue in full force and effect in accordance with their terms, and shall not
be amended, repealed or otherwise modified after the Effective Time in any
manner that would adversely affect the rights thereunder of the individuals who
on or prior to the Effective Time were directors, officers, employees or agents
of the Company or its Subsidiaries, and Parent shall, and shall cause the
Surviving Corporation to (including, if necessary, by providing the Surviving
Corporation with sufficient funding), honor all such indemnification
provisions.

     (b) In the event that the Surviving Corporation or any of its successors
  or assigns (i) consolidates with or merges into any other person and is not
  the continuing or surviving corporation or entity of such consolidation or
  merger or (ii) transfers or conveys all or substantially all of its
  properties and assets to any person, then, and in each such case, Parent
  shall cause proper provision to be made so that the successors and assigns
  of the Surviving Corporation assume the obligations set forth in this
  Section 5.07.

     (c) For six years after the Effective Time, Parent shall, and shall
  cause the Surviving Corporation to (including, if necessary, by providing
  the Surviving Corporation with sufficient funding), maintain in effect and
  honor the Company's current directors' and officers' liability insurance
  covering acts or omissions occurring prior to the Effective Time covering
  each person currently covered by the Company's directors' and officers'
  liability insurance policy on terms with respect to such coverage and
  amounts no less favorable than those of each such policy in effect on the
  date hereof, provided that Parent may substitute therefor policies no less
  favorable in any material respect to such insured persons; provided
  however, that in no event shall Parent be required to pay aggregate
  premiums for insurance under this Section 5.07(c) in excess of 200% of the
  amount of the aggregate premiums paid by the Company in 2000 on an
  annualized basis for such purpose (which 2000 annualized premiums are
  hereby represented and warranted to be $131,250), provided that Parent
  shall nevertheless be obligated to provide such coverage as may be obtained
  for such 200% amount.

     (d) The provisions of this Section 5.07 (i) are intended to be for the
  benefit of, and will be enforceable by, each indemnified party, his or her
  heirs and his or her representatives and (ii) are in addition to, and not
  in substitution for, any other rights to indemnification or contribution
  that any such person may have by contract or otherwise.

   Section 5.08. Fees and Expenses. (a) Except as provided in this Section
5.08, all fees and expenses incurred in connection with the Merger, this
Agreement, the Voting and Option Agreement and the transactions contemplated
hereby and thereby shall be paid by the party incurring such fees or expenses,
whether or not the

                                      A-27
<PAGE>

Merger is consummated, except that each of Parent and the Company shall bear
and pay one-half of (i) the costs and expenses incurred in connection with the
filing, printing and mailing of the Form S-4 and the Proxy Statement (including
SEC filing fees) and (ii) the filing fees for the premerger notification and
report forms under the HSR Act.

     (b) In the event that (A) a Company Takeover Proposal shall have been
  made to the Company or any of its Subsidiaries or shall have been made
  directly to the shareholders of the Company generally or shall have
  otherwise become publicly known or any person shall have publicly announced
  an intention (whether or not conditional) to make a Company Takeover
  Proposal, (B) thereafter this Agreement is terminated by either Parent or
  the Company pursuant to Section 7.01(b)(i) or (ii) or by Parent pursuant to
  Section 7.01(e) and (C) within 12 months after such termination, the
  Company or any of its Subsidiaries enters into an Acquisition Agreement
  with respect to, or consummates, any Company Takeover Proposal (solely for
  purposes of this Section 5.08(b)(i)(C), the term "Company Takeover
  Proposal" shall have the meaning set forth in Section 4.02 except that
  references to 20% therein shall be deemed to be references to 30%), then
  the Company shall pay Parent a fee equal to $7.85 million (the "Termination
  Fee"), payable by wire transfer of same day funds to an account designed by
  Parent in the case of a payment as a result of any event referred to in
  Section 5.08(b)(i)(C), upon the first to occur of such events. The Company
  acknowledges that the agreements contained in this Section 5.08(b) are an
  integral part of the transactions contemplated by this Agreement, and that,
  without these agreements, Parent would not enter into this Agreement;
  accordingly, if the Company fails promptly to pay the amount due pursuant
  to this Section 5.08(b), and, in order to obtain such payment, Parent
  commences a suit that results in a judgment against the Company for the fee
  set forth in this Section 5.08(b), the Company shall pay to Parent its
  costs and expenses (including attorneys' fees and expenses) in connection
  with such suit, together with interest on the amount of the fee from the
  date such payment was required to be made until the date of payment at the
  prime rate of Citibank, N.A. in effect on the date such payment was
  required to be made.

   Section 5.09. Public Announcements. Parent and the Company will consult with
each other before issuing, and provide each other the opportunity to review,
comment upon and concur with, any press release or other public statements with
respect to the transactions contemplated by this Agreement, including the
Merger or the Voting and Option Agreement and shall not issue any such press
release or make any such public statement prior to such consultation, except as
either party may determine is required by applicable law or by obligations
pursuant to any listing agreement with any national securities exchange or
national trading system. The parties agree that the initial press release to be
issued with respect to the transactions contemplated by this Agreement and the
Voting and Option Agreement shall be in the form previously agreed to by the
parties.

   Section 5.10. Affiliates. The Company shall deliver to Parent at least 30
calendar days prior to the Closing Date a letter identifying all persons who
are, at the time this Agreement is submitted for approval by the shareholders
of the Company, "affiliates" of the Company for purposes of Rule 145 under the
Securities Act. The Company shall use its commercially reasonable efforts to
cause each such person, and each other person who becomes such an "affiliate",
to deliver to Parent as of the Closing Date a written agreement substantially
in the form attached as Exhibit A hereto.

   Section 5.11. Nasdaq Quotation. Parent shall use its commercially reasonable
efforts to cause the shares of Parent Class A Common Stock issuable in the
Merger (and the shares of Parent Class A Common Stock issuable upon exercise of
Company Stock Options adjusted as described in Section 5.05(a)) to be approved
for quotation on Nasdaq, subject to official notice of issuance, as promptly as
practicable after the date of this Agreement.

   Section 5.12. Tax Treatment. Each of Parent and the Company shall use its
commercially reasonable efforts to cause the Merger to qualify, and will not
(either before or after consummation of the Merger) take or fail to take any
actions if such actions or such failure to take any actions could reasonably be
expected to prevent the Merger from qualifying, as a "reorganization" within
the meaning of Section 368(a) of the Code

                                      A-28
<PAGE>

and to obtain the opinions of counsel referred to in Section 6.03(c), including
the execution of the letters of representation referred to therein.

   Section 5.13. Further Assurances. The Company shall take, or shall cause to
be taken, any action required by the terms of any note, indenture, credit
agreement, warrant or other financing instrument or preferred stock, as
promptly as possible, as a result of the Merger or the transactions
contemplated by this Agreement or the Voting and Option Agreement.

   Section 5.14. Transfer Taxes. All stock transfer, real estate transfer,
documentary, stamp, recording and other similar taxes (including interest,
penalties and additions to any such taxes) incurred in connection with this
Agreement and the transactions contemplated hereby shall be paid by the
Company.

   Section 5.15. Approvals. The Board of Directors or Compensation Committee of
the Company and Parent shall each grant all approvals and take all other
actions required pursuant to Rules 16b-3(d) and 16b-3(e) under the Exchange Act
to cause the disposition in the Merger of the Company Common Stock and Company
Stock Options and the acquisition in the Merger of Parent Class A Common Stock
and Parent Stock Options, if any, including approving the right to surrender
options as set forth in the Company Stock Plans to be exempt from the
provisions of Section 16(b) of the Exchange Act.

   Section 5.16. Consent of Noteholders. (a) As soon as practicable following
the date of this Agreement, the Company (i) shall prepare and commence a
consent solicitation, on terms acceptable to Parent in its sole discretion (the
"Consent Solicitation"), with respect to (A) all holders of the outstanding 12%
Senior Notes due 2008 of the Company (the "12% Notes") and (B) all holders of
the outstanding 11 1/2% Senior Notes due 2009 of the Company (the "11 1/2%
Notes" and, together with the 12% Notes, the "Notes") and (ii) in order that
the consummation of the Merger and the other transactions contemplated by this
Agreement shall not violate the Indentures, and shall not require a "change of
control" offer to be made to the holders of the Notes (the "Merger
Amendments"), shall use commercially reasonable efforts to (A) amend the
Indenture dated as of July 16, 1998 (the "12% Indenture"), among the Company,
CapRock Telecommunications Corp., CapRock Fiber Network, Ltd., IWL
Communications, Incorporated, and the Chase Manhattan Trust Company, National
Association, relating to the 12% Notes and the Indenture dated as of May 18,
1999 (the "11 1/2% Indenture" and, together with the 12% Indenture, the
"Indentures"), between the Company and Chase Manhattan Trust Company, National
Association, relating to the 11 1/2% Notes or (B) obtain appropriate waivers
from the holders of each of the 12% Notes and the 11 1/2% Notes under their
respective Indentures.

     (b) As part of the Consent Solicitation, the Company shall also use
  commercially reasonable efforts to amend the Indentures to eliminate
  substantially all the restrictive covenants contained therein, including
  Section 7.04 and Articles 8 and 10 (other than Sections 10.01, 10.02,
  10.03, 10.08, 10.09, 10.12, 10.17 and 10.21) of the 12% Indenture and
  Section 7.04 and Articles 8 and 10 (other than Sections 10.01, 10.02,
  10.03, 10.08, 10.09 and 10.12) of the 11 1/2% Indenture (or in each case as
  agreed by Parent and the Company) on terms acceptable to Parent in its sole
  discretion (the "Covenant Amendments" and, together with the Merger
  Amendments, the "Amendments").

     (c) Promptly upon receipt of the Requisite Consent with respect to the
  Consent Solicitation, the Company shall, and shall use its commercially
  reasonable efforts to cause the indenture trustees under the Indentures to,
  execute supplemental indentures incorporating the Amendments. The Merger
  Amendments shall be effective immediately upon execution by the Company and
  the indenture trustees following receipt of the Requisite Consent. The
  Covenant Amendments shall be effective upon the later of (i) the Effective
  Time and (ii) 20 Business Days following commencement by Parent of the
  Notes Exchange Offer as set forth in Section 5.17.

     (d) The Company and Parent shall cooperate with each other with respect
  to the Consent Solicitation and the preparation, form and content of the
  solicitation materials to be distributed to the holders of the Notes.


                                      A-29
<PAGE>

     (e) "Requisite Consent" means the written consent of the holders of at
  least a majority of the aggregate principal amount of the outstanding 12%
  Notes as to any amendment or waiver in respect of the 12% Indenture and the
  holders of at least a majority of the aggregate principal amount of the
  outstanding 11 1/2% Notes as to any amendment or waiver in respect of the
  11 1/2% Indenture.

   Section 5.17. Notes Exchange Offer. (a) As soon as practicable after the
date of this Agreement, Parent shall prepare and file with the SEC a
registration statement on Form S-4 (the "Exchange Offer Statement") in order to
effect an exchange offer (the "Notes Exchange Offer") to acquire all of the
outstanding 12% Notes and 11 1/2% Notes in exchange for notes of Parent (the
"Parent Notes") having the same interest rate, payment, maturity and redemption
terms as the Notes and otherwise with terms that are substantially identical to
those of the 8 1/2% Senior Notes Due 2009 of Parent (the "Exchange
Consideration"), all as more fully set forth in the Exchange Offer Statement.
Parent shall use commercially reasonable efforts to have the Exchange Offer
Statement declared effective, to commence the Notes Exchange Offer and to mail
such Exchange Offer Statement to the holders of the Notes as promptly as
practicable.

     (b) The Exchange Offer Statement will set forth the terms and conditions
  with respect to the Notes Exchange Offer; provided that without limiting
  the foregoing, Parent's obligation to consummate the Exchange Offer shall
  be conditioned on receipt of the Requisite Consent and execution of the
  Amendments related thereto and on consummation of the Merger.

     (c) Parent and the Company shall cooperate with each other with respect
  to the Exchange Offer and the preparation, form and content of the Exchange
  Offer Statement to be distributed to the holders of the Notes.

                                   ARTICLE VI

                              Conditions Precedent

   Section 6.01. Conditions to Each Party's Obligation To Effect the
Merger. The respective obligation of each party to effect the Merger is subject
to the satisfaction or waiver on or prior to the Closing Date of the following
conditions:

     (a) Shareholder Approval. The Company Shareholder Approval shall have
  been obtained.

     (b) HSR Act. The waiting period (and any extension thereof) applicable
  to the Merger under the HSR Act shall have been terminated or shall have
  expired.

     (c) Consents. Each party shall have received reasonably satisfactory
  evidence that Parent or the Company shall have obtained (i) all material
  consents, approvals, authorizations, qualifications and orders of all
  Governmental Entities legally required in connection with this Agreement
  and the transactions contemplated by this Agreement and (ii) all other
  consents, approvals, authorizations, qualifications and orders of
  Governmental Entities or third parties required in connection with this
  Agreement and the transactions contemplated by this Agreement, except, in
  the case of this clause (ii), for those the failure of which to be obtained
  individually or in the aggregate could not reasonably be expected to have a
  Material Adverse Effect on the Company or Parent, as the case may be.

     (d) No Restraints. No judgment, order, decree, injunction, statute, law,
  ordinance, rule or regulation, entered, enacted, promulgated, enforced or
  issued by any court or other Governmental Entity of competent jurisdiction
  or other legal restraint or prohibition (collectively, "Restraints") shall
  be in effect, and there shall not be pending any suit, action or proceeding
  by any Governmental Entity, (i) preventing, or seeking to prevent, the
  consummation of the Merger or (ii) which otherwise could reasonably be
  expected to have a Material Adverse Effect on the Company or Parent, as the
  case may be.

     (e) Form S-4. The Form S-4 shall have become effective under the
  Securities Act. No stop order suspending the effectiveness of the Form S-4
  shall have been issued by the SEC and no proceedings for that purpose shall
  have been initiated or, to the knowledge of Parent or the Company,
  threatened by the

                                      A-30
<PAGE>

  SEC and not concluded or withdrawn. Parent shall have received all other
  federal or state securities permits and other authorizations necessary to
  issue Parent Class A Common Stock in exchange for Company Common Stock and
  to consummate the Merger.

     (f) Nasdaq Quotation. The shares of Parent Class A Common Stock issuable
  to the Company's shareholders in the Merger (and the shares of Parent Class
  A Common Stock issuable upon exercise of Company Stock Options adjusted as
  described in Section 5.05(a)) as contemplated by this Agreement shall have
  been approved for quotation on Nasdaq, subject to official notice of
  issuance.

   Section 6.02. Conditions to Obligations of Parent and Sub. The obligation of
Parent and Sub to effect the Merger is further subject to satisfaction or
waiver of the following conditions:

     (a) Representations and Warranties. The representations and warranties
  of the Company set forth herein that are qualified as to materiality shall
  be true and correct, and those that are not so qualified shall be true and
  correct in all material respects, in each case as of the date hereof and as
  of the Closing Date, with the same effect as if made at and as of such time
  (except to the extent expressly made as of an earlier date, in which case
  as of such date). Parent shall have received a certificate signed by the
  chief executive officer of the Company to such effect.

     (b) Performance of Obligations of the Company. The Company shall have
  performed in all material respects all obligations required to be performed
  by it under this Agreement at or prior to the Closing Date. Parent shall
  have received a certificate signed by the chief executive officer of the
  Company to such effect.

     (c) Consent Solicitation. The Company shall have obtained the Requisite
  Consent with respect to the Consent Solicitation in form and substance
  satisfactory to Parent in its sole discretion and the indenture trustees
  shall have executed the Amendments in connection therewith.

   Section 6.03. Conditions to Obligations of the Company. The obligations of
the Company to effect the Merger and the other transactions contemplated herein
are further subject to satisfaction or waiver of the following conditions:

     (a) Representations and Warranties. The representations and warranties
  of Parent and Sub set forth herein that are qualified as to materiality
  shall be true and correct, and those that are not so qualified shall be
  true and correct in all material respects, in each case as of the date
  hereof and as of the Closing Date, with the same effect as if made at and
  as of such time (except to the extent expressly made as of an earlier date,
  in which case as of such date). The Company shall have received a
  certificate signed by the chief executive officer of Parent to such effect.

     (b) Performance of Obligations of Parent and Sub. Parent and Sub shall
  have performed in all material respects all obligations required to be
  performed by them under this Agreement at or prior to the Closing Date. The
  Company shall have received a certificate signed by the chief executive
  officer of Parent to such effect.

     (c) Tax Opinions. The Company shall have received from Munsch Hardt Kopf
  & Harr, P.C., counsel to the Company, on the date on which the Form S-4 is
  filed with the SEC and on the Closing Date, an opinion, in each case dated
  as of such respective date and to the effect that: (i) the Merger will
  qualify for U.S. Federal income tax purposes as a "reorganization" within
  the meaning of Section 368(a) of the Code and (ii) the Company and Parent
  will each be a "party to a reorganization" within the meaning of Section
  368(b) of the Code. The issuance of such opinion shall be conditioned upon
  the receipt by such counsel of representation letters from each of the
  Company and Parent in substantially the same form as Exhibits B and C,
  respectively.

     (d) Financing Arrangements. The financing arrangements dated as of the
  date hereof, among Parent, the Company and the lenders party thereto (the
  "Financing Arrangements") shall be in full force and effect as of the
  Closing Date, and Parent shall have performed all of its material payment
  obligations

                                      A-31
<PAGE>

  thereunder from the date of its effectiveness through and including the
  Closing Date and shall not be in default thereunder as of the Closing Date.

   Section 6.04. Frustration of Closing Conditions. None of Parent, Sub or the
Company may rely on the failure of any condition set forth in Section 6.01,
6.02 or 6.03, as the case may be, to be satisfied if such failure was caused by
such party's failure to use its commercially reasonable efforts to consummate
the Merger and the other transactions contemplated by this Agreement and the
Voting and Option Agreement, as required by and subject to Section 5.04.

                                  ARTICLE VII

                       Termination, Amendment and Waiver

   Section 7.01. Termination. This Agreement may be terminated at any time
prior to the Effective Time, whether before or after the Company Shareholder
Approval:

     (a) by mutual written consent of Parent and the Company;

     (b) by either Parent or the Company:

       (i) if the Merger shall not have been consummated by March 31, 2001;
    provided, however, that the right to terminate this Agreement pursuant
    to this Section 7.01(b)(i) shall not be available to any party whose
    failure to perform any of its obligations under this Agreement results
    in the failure of the Merger to be consummated by such time;

       (ii) if the Company Shareholder Approval shall not have been
    obtained at a Company Shareholders Meeting duly convened therefor or at
    any adjournment or postponement thereof;

       (iii) if any Restraint having any of the effects set forth in
    Section 6.01(d) shall be in effect and shall have become final and
    nonappealable; provided that the party seeking to terminate this
    Agreement pursuant to this Section 7.01(b)(iii) shall have used its
    commercially reasonable efforts to prevent the entry of and to remove
    such Restraint;

     (c) by Parent, if the Company shall have breached or failed to perform
  in any material respect any of its representations, warranties, covenants
  or other agreements contained in this Agreement, which breach or failure to
  perform (A) would give rise to the failure of a condition set forth in
  Section 6.02(a) or (b), and (B) has not been or is incapable of being cured
  by the Company within 30 calendar days after its receipt of written notice
  from Parent;

     (d) by the Company, if Parent shall have breached or failed to perform
  in any material respect any of its representations, warranties, covenants
  or other agreements contained in this Agreement, which breach or failure to
  perform (A) would give rise to the failure of a condition set forth in
  Section 6.03(a) or (b), and (B) has not been or is incapable of being cured
  by Parent within 30 calendar days after its receipt of written notice from
  the Company;

     (e) by Parent, in the event a Company Adverse Recommendation Change
  shall have occurred;

     (f) by the Company, if Parent shall have breached or failed to perform
  in any material respect any of its covenants or other agreements contained
  in the Financing Arrangements, which breach or failure to perform has not
  been or is incapable of being cured by Parent within 30 calendar days after
  its receipt of written notice from the Company; or

     (g) by Parent, if the condition described in Section 6.02(c) shall not
  be satisfied within 30 days following the date of this Agreement.

   Section 7.02. Effect of Termination. In the event of termination of this
Agreement by either the Company or Parent as provided in Section 7.01, this
Agreement shall forthwith become void and have no effect, without any liability
or obligation on the part of Parent or the Company, other than the provisions
of

                                      A-32
<PAGE>

Section 3.01(p), Section 3.02(k), the last sentence of Section 5.03, Section
5.08, this Section 7.02 and Article VIII, which provisions survive such
termination, and except to the extent that such termination results from the
willful and material breach by a party of any of its representations,
warranties, covenants or agreements set forth in this Agreement, including
Section 4.02.

   Section 7.03. Amendment. This Agreement may be amended by the parties at any
time before or after the Company Shareholder Approval; provided, however, that
after any such approval, there shall not be made any amendment that by law
requires further approval by the shareholders of the Company without the
further approval of such shareholders. This Agreement may not be amended except
by an instrument in writing signed on behalf of each of the parties.

   Section 7.04. Extension; Waiver. At any time prior to the Effective Time, a
party may (a) extend the time for the performance of any of the obligations or
other acts of the other parties, (b) waive any inaccuracies in the
representations and warranties of the other parties contained in this Agreement
or in any document delivered pursuant to this Agreement or (c) subject to the
proviso of Section 7.03, waive compliance by the other party with any of the
agreements or conditions contained in this Agreement. Any agreement on the part
of a party to any such extension or waiver shall be valid only if set forth in
an instrument in writing signed on behalf of such party. The failure of any
party to this Agreement to assert any of its rights under this Agreement or
otherwise shall not constitute a waiver of such rights.

                                  ARTICLE VIII

                               General Provisions

   Section 8.01. Nonsurvival of Representations and Warranties. None of the
representations, warranties, covenants or agreements in this Agreement or in
any instrument delivered pursuant to this Agreement shall survive the Effective
Time. This Section 8.01 shall not limit any covenant or agreement of the
parties which by its terms contemplates performance after the Effective Time.

   Section 8.02. Notices. All notices, requests, claims, demands and other
communications under this Agreement shall be in writing and shall be deemed
given if delivered personally, telecopied (which is confirmed) or sent by
overnight courier (providing proof of delivery) to the parties at the following
addresses (or at such other address for a party as shall be specified by like
notice):

       (a) if to Parent or Sub, to

         McLeodUSA Incorporated
         McLeodUSA Technology Park
         6400 C Street SW
         P.O. Box 3177
         Cedar Rapids, IA 52406-3177

         Telecopy No.: Separately supplied

         Attention: Randall Rings, Esq.
         Vice President, General Counsel and Secretary


         with a copy to:

         Cravath, Swaine & Moore
         Worldwide Plaza
         825 Eighth Avenue
         New York, NY 10019


                                      A-33
<PAGE>

         Telecopy No.: Separately supplied

         Attention: Robert I. Townsend, III, Esq.;

         and

       (b) if to the Company, to

         CapRock Communications Corp.
         15601 Dallas Parkway, Suite 700
         Dallas, TX 75248

         Telecopy No.: Separately supplied

         Attention: Leo J. Cyr
         President and Chief Operating
         Officer

         with a copy to:

         Munsch Hardt Kopf & Harr, P.C.

         4000 Fountain Place
         1445 Ross Avenue
         Dallas, TX 75202
         Telecopy No.: Separately supplied

         Attention: Mike Hainsfurther, Esq.

   Section 8.03. Definitions. For purposes of this Agreement:

     (a) an "Affiliate" of any person means another person that directly or
  indirectly, through one or more intermediaries, controls, is controlled by,
  or is under common control with, such first person, where "control" means
  the possession, directly or indirectly, of the power to direct or cause the
  direction of the management policies of a person, whether through the
  ownership of voting securities, by contract, as trustee or executor, or
  otherwise;

     (b) "Business Day" means any day other than Saturday, Sunday or any
  other day on which banks are legally permitted to be closed in New York;

     (c) "Company Stock Option" means any option to purchase Company Common
  Stock granted under the Company Stock Plans, including options assumed by
  the Company;

     (d) "Company Stock Plans" means the 1998 Equity Incentive Plan and the
  1998 Director Stock Option Plan of the Company, the CapRock
  Telecommunications Nonqualified Stock Option Plan, the CapRock Services
  Employee Incentive Stock Option Plan, the CapRock Services 1997 Stock
  Option Plan and the CapRock Services 1997 Director Stock Option Plan;

     (e) "Knowledge" of any person that is not an individual means, with
  respect to any specific matter, the knowledge of such person's executive
  officers and other officers having primary responsibility for such matter,
  in each case after due inquiry;

     (f) "Liens" means any mortgage, lien, pledge, encumbrance, security
  interest, deed of trust, option, encroachment, reservation, order, decree,
  judgment, condition, restriction, charge, agreement, claim or equity of any
  kind, other than: (i) taxes not yet due or the validity of which is being
  contested in good faith by appropriate proceedings, and as to which the
  Company or Parent, as the case may be, shall, if appropriate under GAAP,
  have set aside in its financial statements and on its books and records
  adequate

                                      A-34
<PAGE>

  reserves; and (ii) deposits under workmen's compensation, unemployment
  insurance, social security and other similar laws, or to secure the
  performance of bids, tenders or contracts (other than for the repayment of
  borrowed money) or to secure statutory obligations or surety or appeal
  bonds, or to secure indemnity, performance or other similar bonds in the
  ordinary course of business;

     (g) "Material Adverse Change" or "Material Adverse Effect" means any
  change, effect or event that, individually or when taken together with all
  other such changes, effects or events, is or is reasonably likely to be
  materially adverse to the business, operations, condition (financial or
  otherwise), assets or liabilities of a person and its Subsidiaries, taken
  as a whole, other than (i) adverse effects caused by changes in the economy
  generally or in securities markets generally or in such person's industry
  (and those of its Subsidiaries) in general and not specifically relating to
  such entity; (ii) the loss of personnel or suppliers or the delay or
  cancellation of orders for the person's services or similar occurrences
  which are the direct and proximate result of the announcement of this
  Agreement and the transactions contemplated hereby; (iii) events set forth
  in Section 8.03(g) of the Company Disclosure Schedule; or (iv) litigation
  brought by or threatened against such person or any member of its Board of
  Directors based upon this Agreement and the transactions contemplated
  hereby;

     (h) "person" means an individual, corporation, partnership, limited
  liability company, joint venture, association, trust, unincorporated
  organization or other entity; and

     (i) a "Subsidiary" of any person means another person, an amount of the
  voting securities, other voting rights or voting partnership interests of
  which is sufficient to elect at least a majority of its Board of Directors
  or other governing body (or, if there are no such voting interests, 50% or
  more of the equity interests of which) is owned directly or indirectly by
  such first person.

   Section 8.04. Interpretation. When a reference is made in this Agreement to
an Article, Section, Subsection or Exhibit, such reference shall be to an
Article, Section or Subsection of, or an Exhibit to, this Agreement unless
otherwise indicated. The table of contents and headings contained in this
Agreement are for reference purposes only and shall not affect in any way the
meaning or interpretation of this Agreement. Whenever the words "include",
"includes" or "including" are used in this Agreement, they shall be deemed to
be followed by the words "without limitation". The words "hereof", "herein" and
"hereunder" and words of similar import when used in this Agreement shall refer
to this Agreement as a whole and not to any particular provision of this
Agreement. All terms defined in this Agreement shall have the defined meanings
when used in any certificate or other document made or delivered pursuant
hereto unless otherwise defined therein. The definitions contained in this
Agreement are applicable to the singular as well as the plural forms of such
terms and to the masculine as well as to the feminine and neuter genders of
such term. Any agreement, instrument or statute defined or referred to herein
or in any agreement or instrument that is referred to herein means such
agreement, instrument or statute as from time to time amended, modified or
supplemented, including (in the case of agreements or instruments) by waiver or
consent and (in the case of statutes) by succession of comparable successor
statutes and references to all attachments thereto and instruments incorporated
therein. References to a person are also to its permitted successors and
assigns. Terms used herein that are defined under GAAP are used herein as so
defined.

   Section 8.05. Counterparts. This Agreement may be executed in one or more
counterparts, all of which shall be considered one and the same agreement and
shall become effective when one or more counterparts have been signed by each
of the parties and delivered to the other parties.

   Section 8.06. Entire Agreement; No Third-Party Beneficiaries. This Agreement
(including the documents and instruments referred to herein), the Voting and
Option Agreement, and the Confidentiality Agreement (a) constitute the entire
agreement, and supersede all prior agreements and understandings, both written
and oral, among the parties with respect to the subject matter of this
Agreement and (b) except for the provisions of Article II and Section 5.07, are
not intended to confer upon any person other than the parties any rights or
remedies.

                                      A-35
<PAGE>

   Section 8.07. Governing Law. This Agreement shall be governed by, and
construed in accordance with, the laws of the State of Delaware, regardless of
the laws that might otherwise govern under applicable principles of conflict of
laws thereof (except to the extent that the provisions of the TBCA shall be
mandatorily applicable to the Merger).

   Section 8.08. Assignment. Neither this Agreement nor any of the rights,
interests or obligations under this Agreement shall be assigned, in whole or in
part, by operation of law or otherwise by either of the parties hereto without
the prior written consent of the other party. Any assignment in violation of
the preceding sentence shall be void. Subject to the preceding two sentences,
this Agreement will be binding upon, inure to the benefit of, and be
enforceable by, the parties and their respective successors and assigns.

   Section 8.09. Enforcement. The parties agree that irreparable damage would
occur and that the parties would not have any adequate remedy at law in the
event that any of the provisions of this Agreement were not performed in
accordance with their specific terms or were otherwise breached. It is
accordingly agreed that the parties shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement and to enforce specifically
the terms and provisions of this Agreement in any Federal court located in the
State of Delaware or in Delaware state court, this being in addition to any
other remedy to which they are entitled at law or in equity. In addition, each
of the parties hereto (a) consents to submit itself to the personal
jurisdiction of any Federal court located in the State of Delaware or any
Delaware state court in the event any dispute arises out of this Agreement or
any of the transactions contemplated by this Agreement, (b) agrees that it will
not attempt to deny or defeat such personal jurisdiction by motion or other
request for leave from any such court, and (c) agrees that it will not bring
any action relating to this Agreement or any of the transactions contemplated
by this Agreement in any court other than a Federal court sitting in the State
of Delaware or a Delaware state court.

                                      A-36
<PAGE>

   IN WITNESS WHEREOF, Parent, Sub and the Company have caused this Agreement
to be signed by their respective officers thereunto duly authorized, all as of
the date first written above.

                                          MCLEODUSA INCORPORATED

                                                 /s/ Blake O. Fisher, Jr.
                                          By: _________________________________
                                            Name:Blake O. Fisher, Jr.
                                            Title:Group Vice President and
                                            Chief Planning & Development
                                            Officer

                                          CACTUS ACQUISITION CORP.

                                                 /s/ Blake O. Fisher, Jr.
                                          By: _________________________________
                                            Name:Blake O. Fisher, Jr.
                                            Title:President

                                          CAPROCK COMMUNICATIONS CORP.

                                                 /s/ Jere W. Thompson, Jr.
                                          By: _________________________________
                                            Name:Jere W. Thompson, Jr.
                                            Title:Chief Executive Officer

                                      A-37
<PAGE>

                                    ANNEX I
                            TO THE MERGER AGREEMENT

                             Index of Defined Terms

<TABLE>
<CAPTION>
Term                                                                       Page
----                                                                       ----
<S>                                                                        <C>
Accounting Rules..........................................................  A-8
Actions................................................................... A-22
Acquisition Agreement..................................................... A-23
Affiliate................................................................. A-34
Agreement.................................................................  A-1
Amendments................................................................ A-29
Business Day.............................................................. A-34
Certificate of Merger.....................................................  A-2
Certificate...............................................................  A-3
Closing...................................................................  A-1
Closing Date..............................................................  A-2
Code......................................................................  A-1
Commonly Controlled Entity................................................ A-12
Communications Act........................................................  A-8
Company...................................................................  A-1
Company Adverse Recommendation Change..................................... A-23
Company Benefit Agreements................................................ A-10
Company Benefit Plans..................................................... A-11
Company Common Stock......................................................  A-1
Company Consolidated Group................................................ A-14
Company Disclosure Schedule...............................................  A-5
Company Filed SEC Documents...............................................  A-9
Company Permits........................................................... A-10
Company Preferred Stock...................................................  A-6
Company SEC Documents.....................................................  A-8
Company Shareholder Approval.............................................. A-14
Company Shareholders Meeting.............................................. A-25
Company Stock Option...................................................... A-34
Company Stock Plans....................................................... A-34
Company Superior Proposal................................................. A-23
Company Takeover Proposal................................................. A-23
Confidentiality Agreement................................................. A-25
Consent Solicitation...................................................... A-29
Contract..................................................................  A-8
Covenant Amendments....................................................... A-29
Dakota Acquisition Stock.................................................. A-15
DGCL......................................................................  A-1
Diamond Partners Options.................................................. A-16
Effective Time............................................................  A-2
11 1/2% Indenture......................................................... A-29
11 1/2% Notes............................................................. A-29
Environmental Laws........................................................ A-11
ERISA..................................................................... A-11
Exchange Act..............................................................  A-8
Exchange Agent............................................................  A-3
Exchange Consideration.................................................... A-30
</TABLE>

                                      A-38
<PAGE>

<TABLE>
<CAPTION>
Term                                                                       Page
----                                                                       ----
<S>                                                                        <C>
Exchange Offer Statement.................................................. A-30
Exchange Ratio............................................................  A-3
FAA.......................................................................  A-8
FCC.......................................................................  A-8
Financing Arrangements.................................................... A-31
Form S-4..................................................................  A-9
GAAP......................................................................  A-9
Governmental Entity.......................................................  A-8
Hazardous Materials....................................................... A-11
HSR Act...................................................................  A-8
Indentures................................................................ A-29
Inlet Options............................................................. A-16
Intellectual Property Rights.............................................. A-14
Knowledge................................................................. A-34
Liens..................................................................... A-34
Material Adverse Change................................................... A-35
Material Adverse Effect................................................... A-35
Merger....................................................................  A-1
Merger Amendments......................................................... A-29
Merger Consideration......................................................  A-3
Nasdaq....................................................................  A-4
Notes..................................................................... A-29
Notes Exchange Offer...................................................... A-30
Notice of Company Superior Proposal....................................... A-23
Noverr Options............................................................ A-15
Parachute Gross-Up Payment................................................ A-13
Parent....................................................................  A-1
Parent Class A Common Stock...............................................  A-1
Parent Class B Common Stock............................................... A-15
Parent Class B Options.................................................... A-16
Parent Class II Preferred Stock........................................... A-15
Parent Disclosure Schedule................................................ A-15
Parent ESPP............................................................... A-16
Parent Filed SEC Documents................................................ A-19
Parent Notes.............................................................. A-30
Parent Plan............................................................... A-26
Parent Preferred Stock.................................................... A-15
Parent SEC Documents...................................................... A-18
Parent Series A Preferred Stock........................................... A-15
Parent Series B Preferred Stock........................................... A-15
Parent Series C Preferred Stock........................................... A-15
Parent Stock Options...................................................... A-16
Parent Stock Plans........................................................ A-16
Parent 401(k)............................................................. A-16
Post-Signing Returns...................................................... A-22
Proxy Statement...........................................................  A-8
PUC(s)....................................................................  A-8
QST Options............................................................... A-15
Representatives........................................................... A-22
Requisite Consent......................................................... A-30
</TABLE>

                                      A-39
<PAGE>

<TABLE>
<CAPTION>
Term                                                                        Page
----                                                                        ----
<S>                                                                         <C>
Restraints................................................................. A-30
SEC........................................................................  A-8
Securities Act.............................................................  A-8
Sub........................................................................  A-1
Subsidiary................................................................. A-35
Surviving Corporation......................................................  A-1
Taxes...................................................................... A-14
TBCA.......................................................................  A-1
Termination Fee............................................................ A-28
Transition Period.......................................................... A-26
12% Indenture.............................................................. A-29
12% Notes.................................................................. A-29
Voting and Option Agreement................................................  A-1
</TABLE>

                                      A-40
<PAGE>

                                                                      APPENDIX B

                          VOTING AND OPTION AGREEMENT

   VOTING AND OPTION AGREEMENT dated as of October 2, 2000 (this "Agreement"),
among MCLEODUSA INCORPORATED, a Delaware corporation ("Parent"), and the
parties listed on Schedule A attached hereto (each, a "Shareholder" and,
collectively, the "Shareholders").

   WHEREAS Parent, Cactus Acquisition Corp., a Delaware corporation and a
wholly owned subsidiary of Parent ("Sub"), and CapRock Communications Corp., a
Texas corporation (the "Company"), propose to enter into an Agreement and Plan
of Merger dated as of the date hereof (as the same may be amended or
supplemented, the "Merger Agreement"; terms used but not defined herein shall
have the meanings set forth in the Merger Agreement) providing for, among other
things, the merger of Sub with and into the Company upon the terms and subject
to the conditions set forth in the Merger Agreement;

   WHEREAS each Shareholder owns (of record or beneficially) the number of
shares of Company Common Stock set forth opposite such Shareholder's name on
Schedule A hereto (such shares, together with any other shares of capital stock
of the Company or other voting securities of the Company acquired (of record or
beneficially) by the Shareholders after the date hereof and during the term of
this Agreement (including through the exercise of any warrants, stock options
or similar instruments), being collectively referred to herein as the "Subject
Shares");

   WHEREAS each Shareholder has agreed to grant Parent an irrevocable option to
purchase such Shareholder's Subject Shares; and

   WHEREAS as a condition to its willingness to enter into the Merger
Agreement, Parent has required that each Shareholder enter into this Agreement.

   NOW, THEREFORE, in consideration of the foregoing and the representations,
warranties, covenants and agreements set forth herein and in the Merger
Agreement, the parties hereto agree as follows:

   Section 1. Grant of Option. Each Shareholder hereby grants Parent an
irrevocable option (the "Option") to purchase such Shareholder's Subject Shares
on the terms and subject to the conditions set forth below:

     (a) Exercise. At any time or from time to time prior to the termination
  of the Option granted hereunder in accordance with the terms of this
  Agreement, Parent (or a wholly owned subsidiary of Parent designated by
  Parent) may exercise the Option, in whole or in part, if on or after the
  date hereof:

       (i) any corporation, partnership, individual, trust, unincorporated
    association, or other entity or person (as defined in Section 13(d)(3)
    of the Securities Exchange Act of 1934, as amended (the "Exchange
    Act")) other than Parent or any of its affiliates (as defined in the
    Exchange Act) (a "Third Party"), shall have:

         (A) commenced or announced an intention to commence a bona fide
      tender offer or exchange offer for any shares of Company Common
      Stock, the consummation of which would result in beneficial
      ownership (as defined under Rule 13d-3 of the Exchange Act) by such
      Third Party (together with all such Third Party's affiliates and
      associates (as such term is defined in the Exchange Act)) of 20% or
      more of the then voting equity of the Company (either on a primary
      or a fully diluted basis);

         (B) filed a Notification and Report Form under the Hart-Scott-
      Rodino Antitrust Improvements Act of 1976, as amended (the "HSR
      Act"), reflecting an intent to acquire the Company or any assets or
      securities of the Company; or

         (C) solicited proxies in a solicitation subject to the proxy
      rules under the Exchange Act, executed any written consent or become
      a participant in any solicitation (as such terms are defined in
      Regulation 14A under the Exchange Act), in each case with respect to
      the Company Common Stock; or

                                      B-1
<PAGE>

       (ii) the events described in Section 7.01(b)(ii) or (e) of the
    Merger Agreement or any other event that would require the Company to
    pay Parent the Termination Fee set forth in Section 5.08 of the Merger
    Agreement occurs (but without the necessity of Parent having terminated
    the Merger Agreement) or, upon a material breach by such Shareholder of
    the covenants in Section 3 of this Agreement.

   Each of the events described in clauses (i) and (ii) hereof shall be
referred to herein as a "Trigger Event." Such Shareholder shall notify Parent
promptly in writing of the occurrence of any Trigger Event; provided, however,
such notice shall not be a condition to the right of Parent to exercise the
Option.

     (b) Exercise Procedure. In the event Parent wishes to exercise the
  Option, Parent shall deliver to such Shareholder a written notice (an
  "Exercise Notice") specifying the total number of such Shareholder's
  Subject Shares it wishes to purchase. Provided that the conditions set
  forth in paragraph (g) hereof to such Shareholder's obligation to sell its
  Subject Shares to Parent hereunder have been satisfied or waived, Parent
  shall, upon delivery of the Exercise Notice and tender of the applicable
  aggregate Exercise Price (as defined below), immediately be deemed to be
  the holder of record of such Subject Shares purchasable upon such exercise,
  notwithstanding that the stock transfer books of the Company shall then be
  closed or that certificates representing such Subject Shares shall not
  theretofore have been delivered to Parent. Each closing of a purchase of
  such Subject Shares (a "Closing") shall occur at a place, on a date and at
  a time designated by Parent in an Exercise Notice delivered at least two
  (2) business days prior to the date of the Closing.

     (c) Termination of the Option. The Option shall terminate upon the
  earliest of: (i) the Effective Time of the Merger; (ii) the termination of
  the Merger Agreement for reasons other than those described in clause (iii)
  below; and (iii) nine (9) months following the termination of the Merger
  Agreement pursuant to Section 7.01(b)(ii) or (e) thereof. Notwithstanding
  the foregoing, if the Option cannot be exercised by reason of any
  applicable judgment, decree, order, law or regulation, the Option shall
  remain exercisable and shall not terminate until the earlier of (x) the
  date on which such impediment shall become final and not subject to appeal,
  and (y) 5:00 p.m. New York City Time, on the tenth (10th) business day
  after such impediment shall have been removed. Notwithstanding the
  termination of the Option, Parent shall be entitled to purchase the Subject
  Shares with respect to which Parent had exercised the Option prior to such
  termination.

     (d) Exercise Price.  The purchase price per share of Company Common
  Stock purchased pursuant to the Option (the "Exercise Price") shall be (i)
  an amount in cash equal to the product of (x) the Exchange Ratio multiplied
  by (y) the average closing price of Parent Class A Common Stock for the
  five (5) trading days preceding the date the Option is exercised (the "Cash
  Exercise Price") or (ii) a number of shares of Parent Class A Common Stock
  equal to the Exchange Ratio (the "Stock Exercise Price"); provided,
  however, that the aggregate Cash Exercise Price paid to such Shareholder
  when aggregated with all other cash purchases of Company Common Stock
  including cash in lieu of fractional shares by Parent shall be limited to
  that amount of cash that would permit any subsequent acquisition of the
  Company by Parent that occurs to qualify as a tax free reorganization under
  the provisions of Section 368(a) of the Code.

     (e) Additional Consideration. Notwithstanding the terms of this Section
  1 or any other provision in this Agreement, in the event that (i) Parent
  exercises in whole or in part the Option granted in this Agreement and (ii)
  the Company thereafter consummates an Alternative Transaction (as defined
  in Section 4(b) below) within twelve months of the exercise of the Option,
  Parent shall pay any Shareholder from whom it purchased Subject Shares in
  connection with the exercise of the Option an amount of additional
  consideration equal to 50% of the difference between the applicable
  aggregate Exercise Price previously paid by Parent to such Shareholder and
  the aggregate amount received by Parent in the Alternative Transaction for
  such Subject Shares. The form of such additional consideration shall be in
  the sole discretion of Parent and may be cash, additional shares of Parent
  Class A Common Stock or the form of consideration received by Parent in the
  Alternative Transaction; provided, however, that Parent shall not

                                      B-2
<PAGE>

  be permitted to pay such additional consideration in the form of Parent
  Class A Common Stock if a Material Adverse Change shall have occurred with
  respect to Parent.

     (f) Pro Rata Exercise. In the event Parent determines to exercise the
  Option in whole or in part, Parent hereby covenants and agrees that it will
  purchase the aggregate number of shares of Company Common Stock being
  sought pro rata from the Shareholders who have entered into this Agreement.

     (g) Conditions to Closing. The obligation of such Shareholder to sell
  such Shareholder's Subject Shares to Parent hereunder is subject to the
  conditions that (i) all waiting periods, if any, under the HSR Act
  applicable to the sale of such Subject Shares by Shareholder and the
  acquisition of such Subject Shares by Parent hereunder shall have expired
  or have been terminated; (ii) all consents, approvals, orders or
  authorizations of, or registrations, declarations or filings with, any
  federal, state or local administrative agency or commission or other
  federal, state or local governmental authority or instrumentality, if any,
  required in connection with the sale of such Subject Shares by such
  Shareholder and the acquisition of such Subject Shares by Parent hereunder
  shall have been obtained or made, as the case may be; and (iii) no
  preliminary or permanent injunction or other order by any court of
  competent jurisdiction prohibiting or otherwise restraining such sale shall
  be in effect.

     (h) Closing. At any Closing,

       (i) such Shareholder shall deliver to Parent a certificate or
    certificates evidencing such Subject Shares being purchased, duly
    endorsed in blank, or with appropriate stock powers, duly executed in
    blank, in proper form for transfer, with the signature of such
    Shareholder thereon guaranteed, and with all applicable taxes paid or
    provided for;

       (ii) Parent shall deliver to such Shareholder (A) by wire transfer
    of immediately available funds to the account or accounts specified in
    writing by such Shareholder the aggregate Cash Exercise Price for the
    Subject Shares so designated and being purchased for cash, and (B) one
    or more certificates representing shares of Parent Class A Common Stock
    equal to the aggregate Stock Exercise Price for the Subject Shares so
    designated and being purchased by delivery of Parent Class A Common
    Stock; and

       (iii) at which Parent is exercising the Option in part, Parent shall
    present and surrender this Agreement to such Shareholder, and such
    Shareholder shall deliver to Parent an executed new agreement with the
    same terms as this Agreement evidencing the right to purchase the
    balance of such Subject Shares purchasable hereunder.

   Section 2. Representations and Warranties of Each Shareholder. Each
Shareholder hereby represents and warrants to Parent as follows:

     (a) Organization; Authority; Execution and Delivery; Enforceability.
   Such Shareholder (i) is duly organized, validly existing and in good
  standing under the laws of its jurisdiction of organization, if applicable,
  and (ii) has the requisite corporate, company, partnership or other power
  and authority to execute and deliver this Agreement, to consummate the
  transactions contemplated hereby and to comply with the terms hereof. The
  execution and delivery by such Shareholder, the consummation by such
  Shareholder of the transactions contemplated hereby and compliance by such
  Shareholder with the provisions hereof have been duly authorized by all
  necessary corporate, company, partnership or other action on the part of
  such Shareholder and no other corporate, company, partnership or other
  proceedings on the part of such Shareholder are necessary to authorize this
  Agreement, to consummate the transactions contemplated hereby or to comply
  with the provisions hereof. This Agreement has been duly executed and
  delivered by such Shareholder and constitutes a valid and binding
  obligation of such Shareholder and, assuming this Agreement constitutes a
  valid and binding obligation of Parent, is enforceable against such
  Shareholder in accordance with its terms, except as enforceability may be
  limited by bankruptcy, insolvency, fraudulent conveyance, reorganization,
  moratorium and other laws affecting the rights and remedies of creditors
  generally and general principles of equity (whether considered in a
  proceeding in

                                      B-3
<PAGE>

  equity or at law). The execution and delivery of this Agreement, the
  consummation of the transactions contemplated hereby and compliance with
  the provisions hereof do not and will not conflict with, or result in any
  violation or breach of, or default (with or without notice or lapse of
  time, or both) under, or give rise to a right of, or result in,
  termination, cancelation or acceleration of any obligation or to loss of a
  material benefit under, or result in the creation of any Lien in or upon
  any of the properties or assets of such Shareholder under, or give rise to
  any increased, additional, accelerated or guaranteed rights or entitlements
  under, any provision of (i) any certificate of incorporation or by-laws,
  partnership agreement or limited liability company agreement (or similar
  organizational documents) of such Shareholder, (ii) any Contract to which
  such Shareholder is a party or any of the properties or assets of such
  Shareholder is subject or (iii) subject to the governmental filings and
  other matters referred to in the following sentence, any (A) statute, law,
  ordinance, rule or regulation or (B) judgment, order or decree, in each
  case, applicable to such Shareholder or its properties or assets, other
  than, in the case of clauses (ii) and (iii), any such conflicts,
  violations, breaches, defaults, rights, losses, Liens or entitlements that
  individually or in the aggregate could not reasonably be expected to impair
  in any material respect the ability of any Shareholder to perform its
  obligations under this Agreement or prevent or materially impede or delay
  the consummation of any of the transactions contemplated by this Agreement.
  No consent, approval, order or authorization of, or registration,
  declaration or filing with, any Governmental Entity is required by or with
  respect to such Shareholder in connection with the execution and delivery
  of this Agreement by such Shareholder, the consummation by such Shareholder
  of the transactions contemplated hereby or the compliance by such
  Shareholder with the provisions hereof, except for (1) filings under the
  HSR Act and any other applicable competition, merger control, antitrust or
  similar law or regulation, (2) filings with the SEC of such reports under
  the Exchange Act as may be required in connection with this Agreement and
  the transactions contemplated hereby and (3) such other consents,
  approvals, orders, authorizations, registrations, declarations and filings
  the failure of which to be obtained or made individually or in the
  aggregate could not reasonably be expected to impair in any material
  respect the ability of such Shareholder to perform its obligations under
  this Agreement or prevent or materially impede or delay the consummation of
  any of the transactions contemplated hereby.

     (b) The Subject Shares. (i) Such Shareholder is the record and
  beneficial owner of, and has good and marketable title to, the Subject
  Shares set forth opposite its name on Schedule A hereto, free and clear of
  any Liens except as set forth on Schedule A. As of the date hereof, other
  than as set forth on Schedule A hereto, such Shareholder does not own (of
  record or beneficially) any shares of capital stock of the Company, and no
  Shareholder owns (of record or beneficially) any options, warrants, rights
  or other similar instruments to acquire any capital stock or other voting
  securities of the Company. Except as set forth on Schedule A, such
  Shareholder has the sole right to Transfer (as defined in Section 4(c)) and
  direct the voting of the Subject Shares set forth opposite its name on
  Schedule A hereto, and none of such Subject Shares is subject to any voting
  trust or other agreement, arrangement or restriction with respect to the
  Transfer or the voting of such Subject Shares, except as set forth in
  Sections 1, 4 and 5 of this Agreement.

       (ii) In the event Parent exercises its Option pursuant to Section 1,
    upon delivery of the Subject Shares covered thereby and payment of the
    aggregate Exercise Price therefor as contemplated in Section 1, Parent
    will receive good and valid title to such Subject Shares free and clear
    of any Liens.

     (c) Investment Representations of Each Shareholder. Each Shareholder
  represents, warrants, and covenants to Parent as follows:

       (i) such Shareholder understands that any issuance of Parent Class A
    Common Stock to such Shareholder pursuant to this Agreement (the
    "Restricted Securities") is intended to be exempt from registration
    under the Securities Act by virtue of Section 4(2) of the Securities
    Act or Regulation D promulgated thereunder, and that no registration
    statement relating to the issuance of the Restricted Securities has
    been or will be filed with the SEC or any state securities commission;


                                      B-4
<PAGE>

       (ii) such Shareholder intends to acquire the Restricted Securities
    solely for its own account, for investment purposes only and not with a
    view to the resale or distribution other than pursuant to an effective
    resale registration statement;

       (iii) such Shareholder agrees not to sell (other than pursuant to an
    effective resale registration statement), transfer, exchange, pledge or
    otherwise dispose of, or make any offer or agreement relating to the
    Restricted Securities and/or any option, right or other interest with
    respect to the Restricted Securities that such Shareholder may acquire,
    unless: (A) counsel representing such Shareholder, which counsel is
    reasonably satisfactory to Parent and Parent's legal counsel, shall
    have advised Parent in a written opinion letter satisfactory to Parent
    and Parent's legal counsel, and upon which Parent and Parent's legal
    counsel may rely, that no registration under the Securities Act would
    be required in connection with the proposed sale, transfer, exchange,
    pledge or other disposition, and (B) all transferees (and other
    subsequent transferees) who receive the Restricted Securities agree to
    be bound by the investment and other restrictions to which such
    Shareholder was subject;

       (iv) such Shareholder is an "accredited investor" as defined in Rule
    501 of Regulation D under the Securities Act, has the capacity to
    protect such Shareholder's interests in connection with this Agreement,
    and has such knowledge and experience in financial, tax and business
    matters to be capable of evaluating the merits and risks of an
    investment in the Restricted Securities and in protecting such
    Shareholder's interests in connection with the investment and, in such
    Shareholder's judgment, has obtained sufficient information from Parent
    to evaluate the merits and risks of an investment in the Restricted
    Securities;

       (v) such Shareholder acknowledges that (A) it has conducted its own
    investigation and review of the business and affairs of Parent, (B) it
    has not relied on any representations or warranties of Parent
    concerning the business and affairs of Parent or an investment in the
    Subject Shares, (C) it has had the opportunity to ask questions of and
    receive information and answers from Parent concerning the terms and
    conditions of this Agreement, the Restricted Securities and other
    matters pertaining to an investment in the Restricted Securities, and
    (D) it has been given the opportunity to verify the information
    provided to it in order for such Shareholder to evaluate the merits and
    risks of an investment in the Restricted Securities, and all such
    questions have been answered and all such information has been provided
    to the full satisfaction of such Shareholder;

       (vi) such Shareholder further acknowledges, represents, agrees and
    is aware that the representations, warranties, agreements, undertakings
    and acknowledgments made by such Shareholder in this Agreement are made
    with the intent that they be relied upon by Parent in determining the
    suitability of such Shareholder as an investor in the Restricted
    Securities; and

       (vii) such Shareholder undertakes to notify Parent immediately of
    any change in any representation, warranty or other information
    relating to such Shareholder set forth herein.

   Section 3. Representations and Warranties of Parent. Parent hereby
represents and warrants to each Shareholder as follows:

     (a) Organization; Authority; Execution and Delivery;
  Enforceability. Parent (i) is duly incorporated, validly existing and in
  good standing under the laws of its jurisdiction of incorporation and (ii)
  has all requisite corporate power and authority to execute and deliver this
  Agreement, to consummate the transactions contemplated hereby and to comply
  with the terms hereof. The execution and delivery of this Agreement by
  Parent, the consummation by Parent of the transactions contemplated hereby
  and compliance by Parent with the provisions hereof have been duly
  authorized by all necessary corporate action on the part of Parent and no
  other corporate proceedings on the part of Parent are necessary to
  authorize this Agreement, to consummate the transactions contemplated
  hereby or to comply with the provisions hereof. This Agreement has been
  duly executed and delivered by Parent and, assuming due execution by each
  Shareholder, constitutes a valid and binding obligation of Parent
  enforceable against Parent in accordance with its terms, except as
  enforceability may be limited by bankruptcy, insolvency,

                                      B-5
<PAGE>

  fraudulent conveyance, reorganization, moratorium and other laws affecting
  the rights and remedies of creditors generally and general principles of
  equity (whether considered in a proceeding in equity or at law). The
  execution and delivery of this Agreement, the consummation of the
  transactions contemplated hereby and compliance with the provisions hereof
  do not and will not conflict with, or result in any violation or breach of,
  or default (with or without notice or lapse of time, or both) under, or
  give rise to a right of, or result in, termination, cancelation or
  acceleration of any obligation or to loss of a material benefit under, or
  result in the creation of any Lien in or upon any of the properties or
  assets of Parent under, or give rise to any increased, additional,
  accelerated or guaranteed rights or entitlements under, any provision of
  (i) the Amended and Restated Certificate of Incorporation or Amended and
  Restated By-laws of Parent, (ii) any Contract to which Parent is a party or
  any of its properties or assets is subject or (iii) subject to the
  governmental filings and other matters referred to in the following
  sentence, any (A) statute, law, ordinance, rule or regulation or (B)
  judgment, order or decree, in each case, applicable to Parent or its
  properties or assets, other than, in the case of clauses (ii) and (iii),
  any such conflicts, violations, breaches, defaults, rights, losses, Liens
  or entitlements that individually or in the aggregate could not reasonably
  be expected to impair in any material respect the ability of Parent to
  perform its obligations under this Agreement or prevent or materially delay
  the consummation of any of the transactions contemplated by this Agreement.
  No consent, approval, order or authorization of, or registration,
  declaration or filing with, any Governmental Entity is required by or with
  respect to Parent in connection with the execution and delivery of this
  Agreement by Parent, the consummation by Parent of the transactions
  contemplated hereby or compliance by Parent with the provisions hereof,
  except for (1) filings under the HSR Act and any other applicable
  competition, merger control, antitrust or similar law or regulation, (2)
  filings with the SEC of such reports under the Exchange Act as may be
  required in connection with this Agreement and the transactions
  contemplated hereby and (3) such other consents, approvals, orders,
  authorizations, registrations, declarations and filings the failure of
  which to be obtained or made individually or in the aggregate could not
  reasonably be expected to impair in any material respect the ability of
  Parent to perform its obligations under this Agreement or prevent or
  materially delay the consummation of any of the transactions contemplated
  hereby.

     (b) Investment Representations of Parent. Parent represents, warrants,
  and covenants to the Shareholder as follows (except as contemplated by this
  Agreement and the Merger Agreement and the transactions contemplated
  thereby):

       (i) Parent does not now have, and as of any Closing will not have,
    any present plan or intention to sell, transfer, exchange, pledge or
    otherwise dispose of, or to effect any other transaction which would
    result in a reduction in the risk of ownership of, the Subject Shares;

       (ii) Parent understands that any sale of the Subject Shares
    hereunder is intended to be exempt from registration, and that no
    registration statement relating to the sale of the Subject Shares in
    connection with this Agreement has been or will be filed with the SEC
    or any state securities commission;

       (iii) Parent intends to acquire the Subject Shares solely for its
    own account, for investment purposes only and not with a view to the
    resale or distribution thereof;

       (iv) Parent agrees not to sell, transfer, exchange, pledge or
    otherwise dispose of, or make any offer or agreement relating to the
    Subject Shares and/or any option, right or other interest with respect
    to the Subject Shares that Parent may acquire, unless: (A) counsel
    representing Parent, which counsel is reasonably satisfactory to the
    Company and the Company's legal counsel, shall have advised the Company
    in a written opinion letter satisfactory to the Company and the
    Company's legal counsel, and upon which the Company and the Company's
    legal counsel may rely, that no registration under the Securities Act
    would be required in connection with the proposed sale, transfer,
    exchange, pledge or other disposition, and (B) all transferees (and
    other subsequent transferees) who receive the Subject Shares agree to
    be bound by the investment and other restrictions to which Parent was
    subject;


                                      B-6
<PAGE>

       (v) Parent is an "accredited investor" as defined in Rule 501 of
    Regulation D under the Securities Act, has the capacity to protect such
    Parent's interests in connection with this Agreement, and has such
    knowledge and experience in financial, tax and business matters to be
    capable of evaluating the merits and risks of an investment in the
    Subject Shares and in protecting Parent's interests in connection with
    the investment and, in Parent's judgment, has obtained sufficient
    information from the Company to evaluate the merits and risks of an
    investment in the Subject Shares;

       (vi) Parent acknowledges that (A) it has conducted its own
    investigation and review of the business and affairs of the Company,
    (B) it has not relied on any representations or warranties of the
    Company concerning the business and affairs of the Company or an
    investment in the Subject Shares, (C) it has had the opportunity to ask
    questions of and receive information and answers from the Company
    concerning the terms and conditions of this Agreement, the Subject
    Shares and other matters pertaining to an investment in the Subject
    Shares, and (D) it has been given the opportunity to verify the
    information provided to it in order for Parent to evaluate the merits
    and risks of an investment in the Subject Shares, and all such
    questions have been answered and all such information has been provided
    to the full satisfaction of Parent;

       (vii) Parent further acknowledges, represents, agrees and is aware
    that the representations, warranties, agreements, undertakings and
    acknowledgments made by Parent in this Agreement are made with the
    intent that they be relied upon by such Shareholder and the Company in
    determining the suitability of Parent as an investor in the Subject
    Shares; and

       (viii) Parent undertakes to notify the Company immediately of any
    change in any representation, warranty or other information relating to
    Parent set forth herein.

   Section 4. Covenants of Each Shareholder. Each Shareholder covenants and
agrees as follows:

     (a) At any meeting of the shareholders of the Company called to vote
  upon the Merger Agreement, the Merger or any of the other transactions
  contemplated by the Merger Agreement, or at any adjournment or postponement
  thereof, or in any other circumstances upon which a vote, consent, adoption
  or other approval (including by written consent solicitation) with respect
  to the Merger Agreement, the Merger or any of the other transactions
  contemplated by the Merger Agreement is sought, such Shareholder shall vote
  (or cause to be voted) all the Subject Shares of such Shareholder (owned of
  record or beneficially) in favor of, and shall consent in writing to (or
  cause to be consented in writing to), the approval of the Merger Agreement
  and the terms thereof and of the Merger and each of the other transactions
  contemplated by the Merger Agreement.

     (b) At any meeting of the shareholders of the Company, or at any
  adjournment or postponement thereof, or in any other circumstances upon
  which a vote, consent, adoption or other approval (including by written
  consent solicitation) is sought, such Shareholder shall vote (or cause to
  be voted) all the Subject Shares of such Shareholder (owned of record or
  beneficially) against, and shall not consent in writing to (and shall cause
  not to be consented in writing to), any of the following (or any agreement
  to enter into, effect, facilitate or support any of the following): (i) any
  Company Takeover Proposal or transaction or occurrence that if proposed and
  offered to the Company or its shareholders (or any of them) would
  constitute a Company Takeover Proposal (collectively, "Alternative
  Transactions") or (ii) any amendment of the Company's Articles of
  Incorporation or By-laws or other proposal, action or transaction involving
  the Company or any of its Subsidiaries or any of its shareholders, which
  amendment or other proposal, action or transaction could reasonably be
  expected to prevent or materially impede or delay the consummation of the
  Merger or the other transactions contemplated by the Merger Agreement or
  the consummation of the transactions contemplated by this Agreement or to
  deprive Parent of any material portion of the benefits anticipated by
  Parent to be received from the consummation of the Merger or the other
  transactions contemplated by the Merger Agreement or this Agreement, or
  change in any manner the voting rights of the Company Common Stock
  (collectively, "Frustrating Transactions").

                                      B-7
<PAGE>

     (c) Other than pursuant to this Agreement, such Shareholder shall not
  (i) sell, transfer, pledge, assign or otherwise dispose of (including by
  gift) (collectively, "Transfer"), or consent to or permit any Transfer of,
  any Subject Shares of such Shareholder or any interest therein, or enter
  into any Contract, option or other arrangement (including any profit
  sharing arrangement) with respect to the Transfer of, or the creation or
  offer of any derivative security in respect of, any Subject Shares of such
  Shareholder, to or with any person or (ii) enter into any voting
  arrangement, whether by proxy, voting agreement or otherwise, with respect
  to any Subject Shares of such Shareholder, and shall not commit or agree to
  take any of the foregoing actions. Such Shareholder shall not, nor shall
  such Shareholder permit any entity under such Shareholder's control to,
  deposit any Subject Shares of such Shareholder in a voting trust.

     (d) Such Shareholder shall not, nor shall such Shareholder permit any of
  its Subsidiaries to, nor shall it authorize or permit any director,
  officer, employee or partner of such Shareholder or any of its Subsidiaries
  or any Representative of such Shareholder or any of its Subsidiaries to,
  directly or indirectly, (i) solicit, initiate or encourage, or take any
  other action designed to facilitate, any Alternative Transaction or
  Frustrating Transaction, (ii) enter into any agreement with respect to any
  Alternative Transaction or Frustrating Transaction or (iii) except to the
  extent the Company shall have previously done so in accordance with Section
  4.02(a) of the Merger Agreement, enter into, continue or otherwise
  participate in any discussions or negotiations regarding, or furnish to any
  person any information with respect to, or otherwise cooperate in any way
  with, or assist or participate in any effort or attempt by any person with
  respect to, any Alternative Transaction or Frustrating Transaction.

     (e) Such Shareholder shall use its commercially reasonable efforts to
  take, or cause to be taken, all actions and to do, or cause to be done, and
  to assist and cooperate with the other parties in doing all things
  necessary, proper or advisable to consummate and make effective, in the
  most expeditious manner practicable, the transactions contemplated by this
  Agreement and the Merger Agreement. Such Shareholder shall not commit or
  agree to take any action inconsistent with the transactions contemplated by
  this Agreement or the transactions contemplated by the Merger Agreement.

     (f) Such Shareholder shall not, nor shall such Shareholder permit any of
  its Subsidiaries to, nor shall it authorize or permit any director,
  officer, employee or partner of such Shareholder or any of its Subsidiaries
  or any Representative of such Shareholder or any of its Subsidiaries to,
  directly or indirectly, issue any press release or make any other public
  statement with respect to the Merger Agreement, this Agreement, the voting
  agreement dated the date hereof among Parent and certain shareholders of
  the Company (the "Voting Agreement"), the Merger or any of the other
  transactions contemplated by the Merger Agreement, the Voting Agreement or
  this Agreement, without the prior written consent of Parent, except as may
  be required by applicable law.

     (g) Notwithstanding anything to the contrary contained herein, nothing
  in this Section 4 shall prohibit any Shareholder from, in his capacity as
  an officer and/or director of the Company, taking any actions, on behalf of
  the Company, that the Company is permitted to take under Section 4.02 of
  the Merger Agreement.

   Section 5. Grant of Proxy; Appointment of Proxy. (a) Each Shareholder hereby
agrees to, promptly upon Parent's request, grant to, and appoint, Parent and
persons designated by the board of directors of Parent, in their respective
capacities as designees of Parent, and any individual who shall hereafter
succeed to any office of Parent held by such individual, and each of them
individually, such Shareholder's proxy and attorney-in-fact (with full power of
substitution), for and in the name, place and stead of such Shareholder, to
vote all such Shareholder's Subject Shares (owned of record or beneficially),
or grant a consent or approval in respect of such Subject Shares, (i) in favor
of the approval of the Merger Agreement and the terms thereof and of the Merger
and each of the other transactions contemplated by the Merger Agreement and
(ii) against any Alternative Transaction or any Frustrating Transaction.


                                      B-8
<PAGE>

     (b) Each Shareholder represents that any proxies heretofore given in
  respect of such Shareholder's Subject Shares are not irrevocable, and that
  all such proxies are hereby revoked.

     (c) Each Shareholder hereby affirms that the agreement to grant a proxy
  set forth in this Section 5 is given in connection with the execution of
  the Merger Agreement and that such agreement is given to secure the
  performance of the duties of such Shareholder under this Agreement. Each
  Shareholder hereby further affirms that any such proxy will be coupled with
  an interest and may under no circumstances be revoked unless and until this
  Agreement is terminated in accordance with Section 9 of this Agreement.
  Each Shareholder hereby ratifies and confirms all that such proxy may
  lawfully do or cause to be done by virtue hereof. Each such proxy shall be
  executed in accordance with the provisions of Article 2.29 of the TBCA.

   Section 6. Further Assurances. Each Shareholder shall from time to time
execute and deliver, or cause to be executed and delivered, such additional or
further consents, documents and other instruments as Parent may request for the
purpose of effectuating the matters covered by this Agreement, including the
grant of proxies set forth in Section 5.

   Section 7. Certain Events. (a) Each Shareholder agrees that this Agreement
and the obligations hereunder shall attach to such Shareholder's Subject Shares
and shall be binding upon any person or entity to which legal or beneficial
ownership of such Subject Shares shall pass, whether by operation of law or
otherwise, including such Shareholder's heirs, guardians, administrators or
successors, and such Shareholder further agrees to take all actions necessary
to effectuate the foregoing. Each Shareholder agrees that each certificate
representing the Subject Shares of such Shareholder shall be inscribed with the
legend required by Section 7(b). In the event of any stock split, stock
dividend, reclassification, merger, reorganization, recapitalization or other
change in the capital structure of the Company affecting the capital stock of
the Company, the number of Subject Shares listed on Schedule A hereto opposite
the name of each Shareholder shall be adjusted appropriately. In the event of
any change in the Company Common Stock or Parent Class A Common Stock by reason
of stock dividends, stock splits, mergers (other than the Mergers),
recapitalizations, combinations, exchange of shares or the like, the type and
number of shares or securities subject to the Option, and the purchase price
per share provided in Section 1(d) hereof, shall be adjusted appropriately, and
proper provision shall be made in the agreements governing such transaction so
that Parent shall receive, upon exercise of the Option, the number and class of
shares or other securities or property that Parent would have received in
respect of the Company Common Stock if the Option had been exercised
immediately prior to such event or the record date therefor, as applicable. In
addition, in the event of any other acquisition of additional shares of capital
stock of the Company or other voting securities of the Company by any
Shareholder (including through the exercise of any warrants, stock options or
similar instruments), the number of Subject Shares listed on Schedule A hereto
opposite the name of such Shareholder shall be adjusted appropriately. This
Agreement and the representations, warranties, covenants, agreements and
obligations hereunder shall attach to any additional shares of capital stock of
the Company or other voting securities of the Company issued to or acquired by
any Shareholder directly or indirectly (including through the exercise of any
warrants, stock options or similar instruments).

     (b) Each Shareholder shall cause the certificated Subject Shares held by
  him to have a legend placed conspicuously on such certificate to the
  following effect:

     The shares of common stock evidenced by this certificate are subject to
  a Voting and Option Agreement dated October 2, 2000, entered into by the
  record owner of such shares and McLeodUSA Incorporated.

   For all uncertificated Subject Shares, each Shareholder shall request that
the Company send notice of such voting agreement as required by Article 2.19(D)
of the TBCA. Each Shareholder shall cause a counterpart of this Agreement to be
deposited with the Company at its principal place of business or registered
office where it shall be subject to the same right of examination by a
shareholder of the Company, in person or by agent or attorney, as are the books
and records of the Company.

                                      B-9
<PAGE>

   Section 8. Assignment. Neither this Agreement nor any of the rights,
interests or obligations under this Agreement shall be assigned, in whole or in
part, by operation of law or otherwise, by any of the parties hereto without
the prior written consent of the other parties hereto, except that Parent may
assign, in its sole discretion, any of or all its rights, interests and
obligations under this Agreement to any of its direct or indirect wholly owned
Subsidiaries, provided that no such assignment shall relieve Parent of any of
its obligations under this Agreement. Any purported assignment in violation of
this Section 8 shall be void. Subject to the preceding sentences of this
Section 8, this Agreement shall be binding upon, inure to the benefit of and be
enforceable by, the parties hereto and their respective successors and assigns.

   Section 9. Termination. Except as set forth below, this Agreement shall
terminate at the time when the Option would otherwise expire under Section
1(c); provided, however, that the provisions of Sections 4(a), 4(b), 4(d), 4(e)
and 5 shall terminate upon the earliest of (i) the Effective Time and (ii) the
termination of the Merger Agreement in accordance with its terms. In the event
of the termination of this Agreement pursuant to this Section 9, except as set
forth herein, this Agreement shall forthwith become null and void, there shall
be no liability on the part of any of the parties, and except as set forth in
this Section 9 all rights and obligations of each party hereto shall cease;
provided, however, that no such termination of this Agreement shall relieve any
party hereto from any liability for any willful and material breach of any
provision of this Agreement prior to termination.

   Section 10. General Provisions. (a) Amendments. This Agreement may not be
amended except by an instrument in writing signed by all of the parties hereto.

     (b) Notices. All notices, requests, claims, demands and other
  communications under this Agreement shall be in writing and shall be deemed
  given if delivered personally, telecopied (with confirmation) or sent by
  overnight or same-day courier (providing proof of delivery) to Parent in
  accordance with Section 8.02 of the Merger Agreement and to the
  Shareholders at their respective addresses set forth on Schedule A hereto
  (or at such other address for a party as shall be specified by like
  notice).

     (c) Interpretation. When a reference is made in this Agreement to a
  Section or a Schedule, such reference shall be to a Section of, or a
  Schedule to, this Agreement unless otherwise indicated. The headings
  contained in this Agreement are for reference purposes only and shall not
  affect in any way the meaning or interpretation of this Agreement. Whenever
  the words "include", "includes" or "including" are used in this Agreement,
  they shall be deemed to be followed by the words "without limitation". The
  words "hereof", "herein" and "hereunder" and words of similar import when
  used in this Agreement shall refer to this Agreement as a whole and not to
  any particular provision of this Agreement. The term "or" is not exclusive.
  The definitions contained in this Agreement are applicable to the singular
  as well as the plural forms of such terms. Any agreement or instrument
  defined or referred to herein or in any agreement or instrument that is
  referred to herein means such agreement or instrument as from time to time
  amended, modified or supplemented. References to a person are also to its
  permitted successors and assigns.

     (d) Counterparts; Effectiveness. This Agreement may be executed in one
  or more counterparts, all of which shall be considered one and the same
  agreement and shall become effective when one or more counterparts have
  been signed by each of the parties hereto and delivered to the other party.
  The effectiveness of this Agreement shall be conditioned upon the execution
  and delivery of the Merger Agreement by each of the parties thereto.

     (e) Entire Agreement; No Third-Party Beneficiaries. This Agreement and
  the Merger Agreement (including the documents and instruments referred to
  herein) (i) constitute the entire agreement and supersede all prior
  agreements and understandings, both written and oral, among the parties
  hereto with respect to the subject matter of this Agreement and (ii) are
  not intended to confer upon any person other than the parties hereto (and
  the persons specified as proxies in Section 5) any rights or remedies.


                                      B-10
<PAGE>

     (f) Governing Law. This agreement shall be governed by and construed in
  accordance with the laws of the State of Delaware, without regard to its
  principles of conflicts of laws (except to the extent that the provisions
  of the TBCA shall be mandatorily applicable to this Agreement).

     (g) Severability. If any term or other provision of this Agreement is
  invalid, illegal or incapable of being enforced by any rule of law or
  public policy, all other conditions and provisions of this Agreement shall
  nevertheless remain in full force and effect. Upon such determination that
  any term or other provision is invalid, illegal or incapable of being
  enforced, the parties hereto shall negotiate in good faith to modify this
  Agreement so as to effect the original intent of the parties as closely as
  possible to the fullest extent permitted by applicable law in an acceptable
  manner and to the end that the transactions contemplated hereby are
  fulfilled to the extent possible.

   Section 11. Enforcement. The parties agree that irreparable damage would
occur and that the parties will not have any adequate remedy at law in the
event that any of the provisions of this Agreement were not performed in
accordance with their specific terms or were otherwise breached. It is
accordingly agreed that the parties shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement and to enforce specifically
the terms and provisions of this Agreement in any court of the United States
located in the State of Delaware or in any Delaware state court, this being in
addition to any other remedy to which they are entitled at law or in equity. In
addition, each of the parties hereto (i) consents to submit itself to the
personal jurisdiction of any court of the United States located in the State of
Delaware or of any Delaware state court in the event any dispute arises out of
this Agreement or the transactions contemplated by this Agreement, (ii) agrees
that it will not attempt to deny or defeat such personal jurisdiction by motion
or other request for leave from any such court, (iii) agrees that it will not
bring any action relating to this Agreement or the transactions contemplated by
this Agreement in any court other than a court of the United States located in
the State of Delaware or a Delaware state court and (iv) waives any right to
trial by jury with respect to any claim or proceeding related to or arising out
of this Agreement or any transaction contemplated by this Agreement.

   Section 12. Agent for Service of Process. Each Shareholder hereby appoints
the Company, with offices on the date hereof as provided for in Section 8.02 of
the Merger Agreement, as its authorized agent (the "Authorized Agent"), upon
whom process may be served in any suit, action or proceeding arising out of or
relating to this Agreement or any transaction contemplated by this Agreement
that may be instituted in any court described in Section 11. Each Shareholder
agrees to take any and all action, including the filing of any and all
documents, that may be necessary to establish and continue such appointment in
full force and effect as aforesaid. Each Shareholder agrees that service of
process upon the Authorized Agent shall be, in every respect, effective service
of process upon such Shareholder.

   Section 13. Shareholder Capacity. No person executing this Agreement who is
or becomes during the term hereof a director or officer of the Company makes
any agreement or understanding herein in his or her capacity as such director
or officer. Each Shareholder signs solely in his or her capacity as the record
holder and beneficial owner of, or the trustee of a trust whose beneficiaries
are the beneficial owners of, such Shareholder's Subject Shares and nothing
herein shall limit or affect any actions taken by a Shareholder in its capacity
as an officer or director of the Company to the extent specifically permitted
by the Merger Agreement.

                                      B-11
<PAGE>

   IN WITNESS WHEREOF, Parent has caused this Agreement to be signed by its
officer thereunto duly authorized and each Shareholder has caused this
Agreement to be signed by its officer thereunto duly authorized, all as of the
date first written above.

                                          MCLEODUSA INCORPORATED

                                             /s/ Blake O. Fisher, Jr.
                                          By: _________________________________
                                          Name:Blake O. Fisher, Jr.
                                          Title:Group Vice President and Chief
                                          Planning & Development Officer

                                          SHAREHOLDERS:

                                             /s/ Jere W. Thompson

                                          -------------------------------------
                                          Jere W. Thompson

                                          WILLIAMSBURG CORPORATION

                                          By: /s/ Jere W. Thompson ____________
                                          Name:Jere W. Thompson
                                          Title:President

                                             /s/ Margaret D. Thompson

                                          -------------------------------------
                                          Margaret D. Thompson

                                             /s/ Jere W. Thompson, Jr.

                                          -------------------------------------
                                          Jere W. Thompson, Jr.

                                          GREENWAY HOLDINGS, LTD.

                                          By: /s/ Jere W. Thompson, Jr. _______
                                          Name:Jere W. Thompson, Jr.
                                          Title:President

                                          CAPROCK SYSTEMS INC.

                                          By: /s/ Jere W. Thompson, Jr. _______
                                          Name:Jere W. Thompson, Jr.
                                          Title:President

                                      B-12
<PAGE>

                                             /s/ Mark Langdale

                                          -------------------------------------
                                          Mark Langdale

                                             /s/ Mark Langdale

                                          -------------------------------------
                                          Mark Langdale, as trustee for
                                          Mark Langdale 1999 Trust
                                          u/a/d April 12, 1999

                                             /s/ Mark Langdale

                                          -------------------------------------
                                          Mark Langdale, as trustee for
                                          Patricia Langdale 1999 Trust
                                          u/a/d April 12, 1999

                                          CAPROCK INVESTORS

                                          By: /s/ Jere W. Thompson, Jr. _______
                                          Name: Jere W. Thompson, Jr.
                                          Title: Managing Joint Venturer

                                             /s/ Timothy W. Rogers

                                          -------------------------------------
                                          Timothy W. Rogers

                                      B-13
<PAGE>

                                                                      APPENDIX C

                                VOTING AGREEMENT

   VOTING AGREEMENT dated as of October 2, 2000 (this "Agreement"), among
MCLEODUSA INCORPORATED, a Delaware corporation ("Parent"), and the parties
listed on Schedule A attached hereto (each, a "Shareholder" and, collectively,
the "Shareholders").

   WHEREAS Parent, Cactus Acquisition Corp., a Delaware corporation and a
wholly owned subsidiary of Parent ("Sub"), and CapRock Communications Corp., a
Texas corporation (the "Company"), propose to enter into an Agreement and Plan
of Merger dated as of the date hereof (as the same may be amended or
supplemented, the "Merger Agreement"; terms used but not defined herein shall
have the meanings set forth in the Merger Agreement) providing for, among other
things, the merger of Sub with and into the Company upon the terms and subject
to the conditions set forth in the Merger Agreement;

   WHEREAS each Shareholder owns (of record or beneficially) the number of
shares of Company Common Stock set forth opposite such Shareholder's name on
Schedule A hereto (such shares, together with any other shares of capital stock
of the Company or other voting securities of the Company acquired (of record or
beneficially) by the Shareholders after the date hereof and during the term of
this Agreement (including through the exercise of any warrants, stock options
or similar instruments), being collectively referred to herein as the "Subject
Shares"); and

   WHEREAS as a condition to its willingness to enter into the Merger
Agreement, Parent has required that each Shareholder enter into this Agreement.

   NOW, THEREFORE, in consideration of the foregoing and the representations,
warranties, covenants and agreements set forth herein and in the Merger
Agreement, the parties hereto agree as follows:

   Section 1. Representations and Warranties of Each Shareholder. Each
Shareholder hereby represents and warrants to Parent as follows:

     (a) Organization; Authority; Execution and Delivery;
  Enforceability. Such Shareholder (i) is duly organized, validly existing
  and in good standing under the laws of its jurisdiction of organization, if
  applicable, and (ii) has the requisite corporate, company, partnership or
  other power and authority to execute and deliver this Agreement, to
  consummate the transactions contemplated hereby and to comply with the
  terms hereof. The execution and delivery by such Shareholder, the
  consummation by such Shareholder of the transactions contemplated hereby
  and compliance by such Shareholder with the provisions hereof have been
  duly authorized by all necessary corporate, company, partnership or other
  action on the part of such Shareholder and no other corporate, company,
  partnership or other proceedings on the part of such Shareholder are
  necessary to authorize this Agreement, to consummate the transactions
  contemplated hereby or to comply with the provisions hereof. This Agreement
  has been duly executed and delivered by such Shareholder and constitutes a
  valid and binding obligation of such Shareholder and, assuming this
  Agreement constitutes a valid and binding obligation of Parent, is
  enforceable against such Shareholder in accordance with its terms, except
  as enforceability may be limited by bankruptcy, insolvency, fraudulent
  conveyance, reorganization, moratorium and other laws affecting the rights
  and remedies of creditors generally and general principles of equity
  (whether considered in a proceeding in equity or at law). The execution and
  delivery of this Agreement, the consummation of the transactions
  contemplated hereby and compliance with the provisions hereof do not and
  will not conflict with, or result in any violation or breach of, or default
  (with or without notice or lapse of time, or both) under, or give rise to a
  right of, or result in, termination, cancelation or acceleration of any
  obligation or to loss of a material benefit under, or result in the
  creation of any Lien in or upon any of the properties or assets of such
  Shareholder under, or give rise to any increased, additional, accelerated
  or guaranteed rights or entitlements under, any provision of (i) any
  certificate of incorporation or by-laws, partnership agreement or limited
  liability company agreement (or similar organizational documents) of such
  Shareholder, (ii) any Contract to which such Shareholder is a party or any
  of the properties or assets of such Shareholder is

                                      C-1
<PAGE>

  subject or (iii) subject to the governmental filings and other matters
  referred to in the following sentence, any (A) statute, law, ordinance,
  rule or regulation or (B) judgment, order or decree, in each case,
  applicable to such Shareholder or its properties or assets, other than, in
  the case of clauses (ii) and (iii), any such conflicts, violations,
  breaches, defaults, rights, losses, Liens or entitlements that individually
  or in the aggregate could not reasonably be expected to impair in any
  material respect the ability of any Shareholder to perform its obligations
  under this Agreement or prevent or materially impede or delay the
  consummation of any of the transactions contemplated by this Agreement. No
  consent, approval, order or authorization of, or registration, declaration
  or filing with, any Governmental Entity is required by or with respect to
  such Shareholder in connection with the execution and delivery of this
  Agreement by such Shareholder, the consummation by such Shareholder of the
  transactions contemplated hereby or the compliance by such Shareholder with
  the provisions hereof, except for (1) filings under the HSR Act and any
  other applicable competition, merger control, antitrust or similar law or
  regulation, (2) filings with the SEC of such reports under the Exchange Act
  as may be required in connection with this Agreement and the transactions
  contemplated hereby and (3) such other consents, approvals, orders,
  authorizations, registrations, declarations and filings the failure of
  which to be obtained or made individually or in the aggregate could not
  reasonably be expected to impair in any material respect the ability of
  such Shareholder to perform its obligations under this Agreement or prevent
  or materially impede or delay the consummation of any of the transactions
  contemplated hereby.

     (b) The Subject Shares. Such Shareholder is the record and beneficial
  owner of, and has good and marketable title to, the Subject Shares set
  forth opposite its name on Schedule A hereto, free and clear of any Liens
  except as set forth on Schedule A. As of the date hereof, other than as set
  forth on Schedule A hereto, such Shareholder does not own (of record or
  beneficially) any shares of capital stock of the Company, and no
  Shareholder owns (of record or beneficially) any options, warrants, rights
  or other similar instruments to acquire any capital stock or other voting
  securities of the Company. Except as set forth on Schedule A, such
  Shareholder has the sole right to Transfer (as defined in Section 3(c)) and
  direct the voting of the Subject Shares set forth opposite its name on
  Schedule A hereto, and none of such Subject Shares is subject to any voting
  trust or other agreement, arrangement or restriction with respect to the
  Transfer or the voting of such Subject Shares, except as set forth in
  Sections 3 and 4 of this Agreement.

   Section 2. Representations and Warranties of Parent. Parent hereby
represents and warrants to each Shareholder as follows: Parent (i) is duly
incorporated, validly existing and in good standing under the laws of its
jurisdiction of incorporation and (ii) has all requisite corporate power and
authority to execute and deliver this Agreement, to consummate the transactions
contemplated hereby and to comply with the terms hereof. The execution and
delivery of this Agreement by Parent, the consummation by Parent of the
transactions contemplated hereby and compliance by Parent with the provisions
hereof have been duly authorized by all necessary corporate action on the part
of Parent and no other corporate proceedings on the part of Parent are
necessary to authorize this Agreement, to consummate the transactions
contemplated hereby or to comply with the provisions hereof. This Agreement has
been duly executed and delivered by Parent and, assuming due execution by each
Shareholder, constitutes a valid and binding obligation of Parent enforceable
against Parent in accordance with its terms, except as enforceability may be
limited by bankruptcy, insolvency, fraudulent conveyance, reorganization,
moratorium and other laws affecting the rights and remedies of creditors
generally and general principles of equity (whether considered in a proceeding
in equity or at law). The execution and delivery of this Agreement, the
consummation of the transactions contemplated hereby and compliance with the
provisions hereof do not and will not conflict with, or result in any violation
or breach of, or default (with or without notice or lapse of time, or both)
under, or give rise to a right of, or result in, termination, cancelation or
acceleration of any obligation or to loss of a material benefit under, or
result in the creation of any Lien in or upon any of the properties or assets
of Parent under, or give rise to any increased, additional, accelerated or
guaranteed rights or entitlements under, any provision of (i) the Amended and
Restated Certificate of Incorporation or Amended and Restated By-laws of
Parent, (ii) any Contract to which Parent is a party or any of its properties
or assets is subject or (iii) subject to the governmental filings and other
matters referred to in

                                      C-2
<PAGE>

the following sentence, any (A) statute, law, ordinance, rule or regulation or
(B) judgment, order or decree, in each case, applicable to Parent or its
properties or assets, other than, in the case of clauses (ii) and (iii), any
such conflicts, violations, breaches, defaults, rights, losses, Liens or
entitlements that individually or in the aggregate could not reasonably be
expected to impair in any material respect the ability of Parent to perform its
obligations under this Agreement or prevent or materially delay the
consummation of any of the transactions contemplated by this Agreement. No
consent, approval, order or authorization of, or registration, declaration or
filing with, any Governmental Entity is required by or with respect to Parent
in connection with the execution and delivery of this Agreement by Parent, the
consummation by Parent of the transactions contemplated hereby or compliance by
Parent with the provisions hereof, except for (1) filings under the HSR Act and
any other applicable competition, merger control, antitrust or similar law or
regulation, (2) filings with the SEC of such reports under the Exchange Act as
may be required in connection with this Agreement and the transactions
contemplated hereby and (3) such other consents, approvals, orders,
authorizations, registrations, declarations and filings the failure of which to
be obtained or made individually or in the aggregate could not reasonably be
expected to impair in any material respect the ability of Parent to perform its
obligations under this Agreement or prevent or materially delay the
consummation of any of the transactions contemplated hereby.

   Section 3. Covenants of Each Shareholder. Each Shareholder covenants and
agrees as follows:

     (a) At any meeting of the shareholders of the Company called to vote
  upon the Merger Agreement, the Merger or any of the other transactions
  contemplated by the Merger Agreement, or at any adjournment or postponement
  thereof, or in any other circumstances upon which a vote, consent, adoption
  or other approval (including by written consent solicitation) with respect
  to the Merger Agreement, the Merger or any of the other transactions
  contemplated by the Merger Agreement is sought, such Shareholder shall vote
  (or cause to be voted) all the Subject Shares of such Shareholder (owned of
  record or beneficially) in favor of, and shall consent in writing to (or
  cause to be consented in writing to), the approval of the Merger Agreement
  and the terms thereof and of the Merger and each of the other transactions
  contemplated by the Merger Agreement.

     (b) At any meeting of the shareholders of the Company, or at any
  adjournment or postponement thereof, or in any other circumstances upon
  which a vote, consent, adoption or other approval (including by written
  consent solicitation) is sought, such Shareholder shall vote (or cause to
  be voted) all the Subject Shares of such Shareholder (owned of record or
  beneficially) against, and shall not consent in writing to (and shall cause
  not to be consented in writing to), any of the following (or any agreement
  to enter into, effect, facilitate or support any of the following): (i) any
  Company Takeover Proposal or transaction or occurrence that if proposed and
  offered to the Company or its shareholders (or any of them) would
  constitute a Company Takeover Proposal (collectively, "Alternative
  Transactions") or (ii) any amendment of the Company's Articles of
  Incorporation or By-laws or other proposal, action or transaction involving
  the Company or any of its Subsidiaries or any of its shareholders, which
  amendment or other proposal, action or transaction could reasonably be
  expected to prevent or materially impede or delay the consummation of the
  Merger or the other transactions contemplated by the Merger Agreement or
  the consummation of the transactions contemplated by this Agreement or to
  deprive Parent of any material portion of the benefits anticipated by
  Parent to be received from the consummation of the Merger or the other
  transactions contemplated by the Merger Agreement or this Agreement, or
  change in any manner the voting rights of the Company Common Stock
  (collectively, "Frustrating Transactions").

     (c) Other than pursuant to this Agreement, such Shareholder shall not
  (i) sell, transfer, pledge, assign or otherwise dispose of (including by
  gift) (collectively, "Transfer"), or consent to or permit any Transfer of,
  any Subject Shares of such Shareholder or any interest therein, or enter
  into any Contract, option or other arrangement (including any profit
  sharing arrangement) with respect to the Transfer of, or the creation or
  offer of any derivative security in respect of, any Subject Shares of such
  Shareholder, to or with any person or (ii) enter into any voting
  arrangement, whether by proxy, voting agreement or otherwise, with respect
  to any Subject Shares of such Shareholder, and shall not commit or agree to
  take any of the foregoing actions. Such Shareholder shall not, nor shall
  such Shareholder permit any entity

                                      C-3
<PAGE>

  under such Shareholder's control to, deposit any Subject Shares of such
  Shareholder in a voting trust.

     (d) Such Shareholder shall not, nor shall such Shareholder permit any of
  its Subsidiaries to, nor shall it authorize or permit any director,
  officer, employee or partner of such Shareholder or any of its Subsidiaries
  or any Representative of such Shareholder or any of its Subsidiaries to,
  directly or indirectly, (i) solicit, initiate or encourage, or take any
  other action designed to facilitate, any Alternative Transaction or
  Frustrating Transaction, (ii) enter into any agreement with respect to any
  Alternative Transaction or Frustrating Transaction or (iii) except to the
  extent the Company shall have previously done so in accordance with Section
  4.02(a) of the Merger Agreement, enter into, continue or otherwise
  participate in any discussions or negotiations regarding, or furnish to any
  person any information with respect to, or otherwise cooperate in any way
  with, or assist or participate in any effort or attempt by any person with
  respect to, any Alternative Transaction or Frustrating Transaction.

     (e) Such Shareholder shall use its commercially reasonable efforts to
  take, or cause to be taken, all actions and to do, or cause to be done, and
  to assist and cooperate with the other parties in doing all things
  necessary, proper or advisable to consummate and make effective, in the
  most expeditious manner practicable, the transactions contemplated by this
  Agreement and the Merger Agreement. Such Shareholder shall not commit or
  agree to take any action inconsistent with the transactions contemplated by
  this Agreement or the transactions contemplated by the Merger Agreement.

     (f) Such Shareholder shall not, nor shall such Shareholder permit any of
  its Subsidiaries to, nor shall it authorize or permit any director,
  officer, employee or partner of such Shareholder or any of its Subsidiaries
  or any Representative of such Shareholder or any of its Subsidiaries to,
  directly or indirectly, issue any press release or make any other public
  statement with respect to the Merger Agreement, this Agreement, the voting
  and option agreement dated the date hereof among Parent and certain
  shareholders of the Company (the "Voting and Option Agreement"), the Merger
  or any of the other transactions contemplated by the Merger Agreement, the
  Voting and Option Agreement or this Agreement, without the prior written
  consent of Parent, except as may be required by applicable law.

     (g) Notwithstanding anything to the contrary contained herein, nothing
  in this Section 3 shall prohibit any Shareholder from, in his capacity as
  an officer and/or director of the Company, taking any actions, on behalf of
  the Company, that the Company is permitted to take under Section 4.02 of
  the Merger Agreement.

   Section 4. Grant of Proxy; Appointment of Proxy. (a) Each Shareholder hereby
agrees to, promptly upon Parent's request, grant to, and appoint, Parent and
persons designated by the board of directors of Parent, in their respective
capacities as designees of Parent, and any individual who shall hereafter
succeed to any office of Parent held by such individual, and each of them
individually, such Shareholder's proxy and attorney-in-fact (with full power of
substitution), for and in the name, place and stead of such Shareholder, to
vote all such Shareholder's Subject Shares (owned of record or beneficially),
or grant a consent or approval in respect of such Subject Shares, (i) in favor
of the approval of the Merger Agreement and the terms thereof and of the Merger
and each of the other transactions contemplated by the Merger Agreement and
(ii) against any Alternative Transaction or any Frustrating Transaction.

     (b) Each Shareholder represents that any proxies heretofore given in
  respect of such Shareholder's Subject Shares are not irrevocable, and that
  all such proxies are hereby revoked.

     (c) Each Shareholder hereby affirms that the agreement to grant a proxy
  set forth in this Section 4 is given in connection with the execution of
  the Merger Agreement and that such agreement is given to secure the
  performance of the duties of such Shareholder under this Agreement. Each
  Shareholder hereby further affirms that any such proxy will be coupled with
  an interest and may under no circumstances be revoked unless and until this
  Agreement is terminated in accordance with Section 8 of this Agreement.
  Each Shareholder hereby ratifies and confirms all that such proxy may
  lawfully do or cause to be done by virtue hereof. Each such proxy shall be
  executed in accordance with the provisions of Article 2.29 of the TBCA.


                                      C-4
<PAGE>

   Section 5. Further Assurances. Each Shareholder shall from time to time
execute and deliver, or cause to be executed and delivered, such additional or
further consents, documents and other instruments as Parent may request for the
purpose of effectuating the matters covered by this Agreement, including the
grant of proxies set forth in Section 4.

   Section 6. Certain Events. (a) Each Shareholder agrees that this Agreement
and the obligations hereunder shall attach to such Shareholder's Subject Shares
and shall be binding upon any person or entity to which legal or beneficial
ownership of such Subject Shares shall pass, whether by operation of law or
otherwise, including such Shareholder's heirs, guardians, administrators or
successors, and such Shareholder further agrees to take all actions necessary
to effectuate the foregoing. Each Shareholder agrees that each certificate
representing the Subject Shares of such Shareholder shall be inscribed with the
legend required by Section 6(b). In the event of any stock split, stock
dividend, reclassification, merger, reorganization, recapitalization or other
change in the capital structure of the Company affecting the capital stock of
the Company, the number of Subject Shares listed on Schedule A hereto opposite
the name of each Shareholder shall be adjusted appropriately. In addition, in
the event of any other acquisition of additional shares of capital stock of the
Company or other voting securities of the Company by any Shareholder (including
through the exercise of any warrants, stock options or similar instruments),
the number of Subject Shares listed on Schedule A hereto opposite the name of
such Shareholder shall be adjusted appropriately. This Agreement and the
representations, warranties, covenants, agreements and obligations hereunder
shall attach to any additional shares of capital stock of the Company or other
voting securities of the Company issued to or acquired by any Shareholder
directly or indirectly (including through the exercise of any warrants, stock
options or similar instruments).

     (b) Each Shareholder shall cause the certificated Subject Shares held by
  him to have a legend placed conspicuously on such certificate to the
  following effect:

       The shares of common stock evidenced by this certificate are subject
    to a Voting Agreement dated October 2, 2000 entered into by the record
    owner of such shares and McLeodUSA Incorporated.

   For all uncertificated Subject Shares each Shareholder shall request that
the Company send notice of such voting agreement as required by Article 2.19(D)
of the TBCA. Each Shareholder shall cause a counterpart of this Agreement to be
deposited with the Company at its principal place of business or registered
office where it shall be subject to the same right of examination by a
shareholder of the Company, in person or by agent or attorney, as are the books
and records of the Company.

   Section 7. Assignment. Neither this Agreement nor any of the rights,
interests or obligations under this Agreement shall be assigned, in whole or in
part, by operation of law or otherwise, by any of the parties hereto without
the prior written consent of the other parties hereto, except that Parent may
assign, in its sole discretion, any of or all its rights, interests and
obligations under this Agreement to any of its direct or indirect wholly owned
Subsidiaries, provided that no such assignment shall relieve Parent of any of
its obligations under this Agreement. Any purported assignment in violation of
this Section 7 shall be void. Subject to the preceding sentences of this
Section 7, this Agreement shall be binding upon, inure to the benefit of and be
enforceable by, the parties hereto and their respective successors and assigns.

   Section 8. Termination. Except as set forth below, this Agreement shall
terminate upon the earliest of (i) the Effective Time and (ii) the termination
of the Merger Agreement in accordance with its terms. In the event of the
termination of this Agreement pursuant to this Section 8, except as set forth
herein, this Agreement shall forthwith become null and void, there shall be no
liability on the part of any of the parties, and except as set forth in this
Section 8 all rights and obligations of each party hereto shall cease;
provided, however, that no such termination of this Agreement shall relieve any
party hereto from any liability for any willful and material breach of any
provision of this Agreement prior to termination.

                                      C-5
<PAGE>

   Section 9. General Provisions. (a) Amendments. This Agreement may not be
amended except by an instrument in writing signed by all of the parties hereto.

     (b) Notices. All notices, requests, claims, demands and other
  communications under this Agreement shall be in writing and shall be deemed
  given if delivered personally, telecopied (with confirmation) or sent by
  overnight or same-day courier (providing proof of delivery) to Parent in
  accordance with Section 8.02 of the Merger Agreement and to the
  Shareholders at their respective addresses set forth on Schedule A hereto
  (or at such other address for a party as shall be specified by like
  notice).

     (c) Interpretation. When a reference is made in this Agreement to a
  Section or a Schedule, such reference shall be to a Section of, or a
  Schedule to, this Agreement unless otherwise indicated. The headings
  contained in this Agreement are for reference purposes only and shall not
  affect in any way the meaning or interpretation of this Agreement. Whenever
  the words "include", "includes" or "including" are used in this Agreement,
  they shall be deemed to be followed by the words "without limitation". The
  words "hereof", "herein" and "hereunder" and words of similar import when
  used in this Agreement shall refer to this Agreement as a whole and not to
  any particular provision of this Agreement. The term "or" is not exclusive.
  The definitions contained in this Agreement are applicable to the singular
  as well as the plural forms of such terms. Any agreement or instrument
  defined or referred to herein or in any agreement or instrument that is
  referred to herein means such agreement or instrument as from time to time
  amended, modified or supplemented. References to a person are also to its
  permitted successors and assigns.

     (d) Counterparts; Effectiveness. This Agreement may be executed in one
  or more counterparts, all of which shall be considered one and the same
  agreement and shall become effective when one or more counterparts have
  been signed by each of the parties hereto and delivered to the other party.
  The effectiveness of this Agreement shall be conditioned upon the execution
  and delivery of the Merger Agreement by each of the parties thereto.

     (e) Entire Agreement; No Third-Party Beneficiaries. This Agreement and
  the Merger Agreement (including the documents and instruments referred to
  herein) (i) constitute the entire agreement and supersede all prior
  agreements and understandings, both written and oral, among the parties
  hereto with respect to the subject matter of this Agreement and (ii) are
  not intended to confer upon any person other than the parties hereto (and
  the persons specified as proxies in Section 4) any rights or remedies.

     (f) Governing Law. This agreement shall be governed by and construed in
  accordance with the laws of the State of Delaware, without regard to its
  principles of conflicts of laws (except to the extent that the provisions
  of the TBCA shall be mandatorily applicable to this Agreement).

     (g) Severability. If any term or other provision of this Agreement is
  invalid, illegal or incapable of being enforced by any rule of law or
  public policy, all other conditions and provisions of this Agreement shall
  nevertheless remain in full force and effect. Upon such determination that
  any term or other provision is invalid, illegal or incapable of being
  enforced, the parties hereto shall negotiate in good faith to modify this
  Agreement so as to effect the original intent of the parties as closely as
  possible to the fullest extent permitted by applicable law in an acceptable
  manner and to the end that the transactions contemplated hereby are
  fulfilled to the extent possible.

   Section 10. Enforcement. The parties agree that irreparable damage would
occur and that the parties will not have any adequate remedy at law in the
event that any of the provisions of this Agreement were not performed in
accordance with their specific terms or were otherwise breached. It is
accordingly agreed that the parties shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement and to enforce specifically
the terms and provisions of this Agreement in any court of the United States
located in the State of Delaware or in any Delaware state court, this being in
addition to any other remedy to which they are entitled at law or in equity. In
addition, each of the parties hereto (i) consents to submit itself to the
personal jurisdiction of any court of the United States located in the State of
Delaware or of any Delaware state court in the event any dispute arises out of
this Agreement or the transactions contemplated by this Agreement, (ii)

                                      C-6
<PAGE>

agrees that it will not attempt to deny or defeat such personal jurisdiction by
motion or other request for leave from any such court, (iii) agrees that it
will not bring any action relating to this Agreement or the transactions
contemplated by this Agreement in any court other than a court of the United
States located in the State of Delaware or a Delaware state court and (iv)
waives any right to trial by jury with respect to any claim or proceeding
related to or arising out of this Agreement or any transaction contemplated by
this Agreement.

   Section 11. Agent for Service of Process. Each Shareholder hereby appoints
the Company, with offices on the date hereof as provided for in Section 8.02 of
the Merger Agreement, as its authorized agent (the "Authorized Agent"), upon
whom process may be served in any suit, action or proceeding arising out of or
relating to this Agreement or any transaction contemplated by this Agreement
that may be instituted in any court described in Section 10. Each Shareholder
agrees to take any and all action, including the filing of any and all
documents, that may be necessary to establish and continue such appointment in
full force and effect as aforesaid. Each Shareholder agrees that service of
process upon the Authorized Agent shall be, in every respect, effective service
of process upon such Shareholder.

   Section 12. Shareholder Capacity. No person executing this Agreement who is
or becomes during the term hereof a director or officer of the Company makes
any agreement or understanding herein in his or her capacity as such director
or officer. Each Shareholder signs solely in his or her capacity as the record
holder and beneficial owner of, or the trustee of a trust whose beneficiaries
are the beneficial owners of, such Shareholder's Subject Shares and nothing
herein shall limit or affect any actions taken by a Shareholder in its capacity
as an officer or director of the Company to the extent specifically permitted
by the Merger Agreement.

   IN WITNESS WHEREOF, Parent has caused this Agreement to be signed by its
officer thereunto duly authorized and each Shareholder has caused this
Agreement to be signed by its officer thereunto duly authorized, all as of the
date first written above.

                                          MCLEODUSA INCORPORATED

                                             /s/ Blake O. Fisher, Jr.
                                          By: _________________________________
                                            Name: Blake O. Fisher, Jr.
                                            Title:  Group Vice President and
                                            Chief Planning
                                               & Development Officer


                                          SHAREHOLDER:

                                             /s/ Timothy M. Terrell
                                          -------------------------------

                                          Timothy M. Terrell

                                      C-7
<PAGE>

                                                                      APPENDIX D

[Salomon Smith Barney Letterhead]

October 2, 2000

The Board of Directors
CapRock Communications Corp.
15601 Dallas Parkway, Suite 700
Dallas, Texas 75248

Members of the Board:

   You have requested our opinion as to the fairness, from a financial point of
view, to the holders of the common stock of CapRock Communications Corp.
("CapRock") of the Exchange Ratio (defined below) set forth in the Agreement
and Plan of Merger, dated as of October 2, 2000 (the "Merger Agreement"), among
McLeodUSA Incorporated ("McLeodUSA"), Cactus Acquisition Corp., a wholly owned
subsidiary of McLeodUSA ("Sub"), and CapRock. As more fully described in the
Merger Agreement, Sub will be merged with and into CapRock (the "Merger")
pursuant to which each outstanding share of the common stock, par value $0.01
per share, of CapRock ("CapRock Common Stock") (other than shares owned by
CapRock, Sub or McLeodUSA) will be converted into the right to receive 0.3876
of a share (the "Exchange Ratio") of the Class A common stock, par value $0.01
per share, of McLeodUSA (the "McLeodUSA Common Stock").

   In arriving at our opinion, we reviewed drafts of the Merger Agreement and
held discussions with certain senior officers, directors and other
representatives and advisors of CapRock and certain senior officers and other
representatives and advisors of McLeodUSA concerning the businesses, operations
and prospects of CapRock and McLeodUSA, respectively. We examined certain
publicly available business and financial information relating to CapRock and
McLeodUSA as well as certain financial forecasts and other information and data
for CapRock and McLeodUSA which were provided to or otherwise discussed with us
by the managements of CapRock and McLeodUSA, respectively, including
information relating to certain strategic implications and operational benefits
anticipated to result from the Merger. We reviewed the financial terms of the
Merger as set forth in the Merger Agreement in relation to, among other things:
current and historical market prices and trading volumes of CapRock Common
Stock and McLeodUSA Common Stock; the historical and projected earnings and
other operating data of CapRock and McLeodUSA; and the capitalization and
financial condition of CapRock and McLeodUSA. In this regard, we have also
considered, in light of the capital resources available to CapRock, CapRock's
current cash requirements for working capital, including for short-term
obligations to suppliers, and its other near-term liquidity needs. We
considered, to the extent publicly available, the financial terms of certain
other similar transactions recently effected which we considered relevant in
evaluating the Merger and analyzed certain financial, stock market and other
publicly available information relating to the businesses of other companies
whose operations we considered relevant in evaluating those of CapRock and
McLeodUSA. We also evaluated the pro forma financial impact of the Merger on
McLeodUSA. In connection with our engagement, we were requested to approach,
and we held discussions with, third parties to solicit indications of interest
in the possible acquisition of all or a part of CapRock or in providing
financing to CapRock. In addition to the foregoing, we conducted such other
analyses and examinations and considered such other information and financial,
economic and market criteria as we deemed appropriate in arriving at our
opinion.

   In rendering our opinion, we have assumed and relied, without independent
verification, upon the accuracy and completeness of all financial and other
information and data publicly available or furnished to or otherwise reviewed
by or discussed with us. With respect to financial forecasts and other
information and data provided to or otherwise reviewed by or discussed with us,
we have been advised by the respective managements of CapRock and McLeodUSA
that such forecasts and other information and data were reasonably prepared on
bases reflecting the best currently available estimates and judgments of the
respective managements of CapRock and McLeodUSA as to the future financial
performance of CapRock and McLeodUSA, respectively,

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and the strategic implications and operational benefits anticipated to result
from the Merger. We have assumed, with your consent, that the Merger will be
consummated in accordance with the terms of the Merger Agreement and the other
agreements entered into in connection therewith, and will be treated as a tax-
free reorganization for federal income tax purposes. We also have assumed, with
your consent, that in the course of obtaining the necessary regulatory or third
party approvals for the Merger, no limitations, restrictions or conditions will
be imposed that would have an adverse effect on CapRock or McLeodUSA or the
contemplated benefits to CapRock of the Merger. Our opinion, as set forth
herein, relates to the relative values of CapRock and McLeodUSA. We are not
expressing any opinion as to what the value of McLeodUSA Common Stock actually
will be when issued pursuant to the Merger or the price at which McLeodUSA
Common Stock will trade subsequent to the Merger. We have not made or been
provided with an independent evaluation or appraisal of the assets or
liabilities (contingent or otherwise) of CapRock or McLeodUSA or of the
solvency of either entity, nor have we made any physical inspection of the
properties or assets of CapRock or McLeodUSA. Our opinion does not address the
relative merits of the Merger as compared to any alternative business
strategies that might exist for CapRock or the effect of any other transaction
in which CapRock might engage. Our opinion is necessarily based upon
information available to us, and financial, stock market and other conditions
and circumstances existing and disclosed to us, as of the date hereof.

   Salomon Smith Barney Inc. has acted as financial advisor to CapRock in
connection with the proposed Merger and will receive a fee for such services, a
significant portion of which is contingent upon the consummation of the Merger.
We have in the past provided investment banking services to CapRock and
McLeodUSA, respectively, unrelated to the proposed Merger, for which services
we have received compensation. In the ordinary course of our business, we and
our affiliates may actively trade or hold the securities of CapRock and
McLeodUSA for our own account or for the account of our customers and,
accordingly, may at any time hold a long or short position in such securities.
In addition, we and our affiliates (including Citigroup Inc. and its
affiliates) may maintain other business relationships with CapRock, McLeodUSA
and their respective affiliates.

   Our advisory services and the opinion expressed herein are provided solely
for the information of the Board of Directors of CapRock in its evaluation of
the proposed Merger, and our opinion is not intended to be and does not
constitute a recommendation to any stockholder as to how such stockholder
should vote on any matters relating to the proposed Merger.

   Based upon and subject to the foregoing, our experience as investment
bankers, our work as described above and other factors we deemed relevant, we
are of the opinion that, as of the date hereof, the Exchange Ratio is fair,
from a financial point of view, to the holders of CapRock Common Stock (other
than McLeodUSA and its affiliates).


                                          Very truly yours,

                                          /s/ Salomon Smith Barney Inc.

                                          SALOMON SMITH BARNEY INC.

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